單位換算- 維基百科,自由的百科全書
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體積編輯 ; sack(美國), ≡ 3 bu (US lvl) ; seam, ≡ 8 bu (US lvl) ; shot, ≡ 1 US fl oz ; strike(英制), ≡ 2 bu (imp) ...
單位換算
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編輯
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單位換算是指通過乘以換算係數實現不同計量單位間的等量換算。
目次
1換算技術
1.1過程
1.2換算係數
1.3表格次序
2換算係數表
2.1長度
2.2面積
2.3體積
2.4平面角
2.5立體角
2.6質量
2.7密度
2.8時間
2.9頻率
2.10速度或速率
2.11流量(容積)
2.12加速度
2.13力
2.14壓力或機械應力Pressureormechanicalstress
2.15Torqueormomentofforce
2.16能量
2.17Powerorheatflowrate
2.18Action
2.19Dynamic黏度
2.20Kinematic黏度
2.21電流
2.22Electriccharge
2.23Electricdipole
2.24Electromotiveforce,electricpotentialdifference
2.25Electricalresistance
2.26電容Capacitance
2.27Magneticflux
2.28Magneticfluxdensity
2.29Inductance
2.30溫度
2.31Informationentropy
2.32Luminousintensity
2.33Luminance
2.34Luminousflux
2.35Illuminance
2.36Radiation-sourceactivity
2.37Radiation-exposure
2.38Radiation-absorbeddose
2.39Radiation-equivalentdose
3Softwaretools
3.1Generalcommercialsourcesofconverters
4Infiction
5參見
6參考資料
7外部連結
換算技術編輯
過程編輯
單位換算過程與用戶具體情況和預期目的相關。
可能受法令、合同、技術規格或其它出版物技術標準的限制。
工程判斷可能包括以下因素:
計量準確與精密度與相關測量的不準確度
初始量測統計置信區間或容許區間
計量有效數字位數
包括工程容差計量的預期用途某些從一個單位系統需要不增減精度地向另一個單位體系嚴密轉換第一個量度。
有時被稱為「軟轉換」。
它不涉及更改被計量的物理配置。
與之相比,「硬轉換」或「適應轉換」可能不完全相等。
它更改計量以適合在新體系內的有效數字與單位。
它有時涉及項目的稍微不同的配置或尺寸替代。
有時允許並使用標稱值。
換算係數編輯
此條目內不列出在公制單位國際單位制詞頭間的轉換(例如:1千克=1000 克,1毫克=0.001 克)。
除非單位還有其他常見名稱。
表格次序編輯
各表內的單位以其英文字詞的字母順序列出,突出顯示SI單位(基本單位或導出單位)。
換算係數表編輯
此條目給出列於索引內的各個物理量數值轉換係數列表。
各物理量不同單位的數值以相應的SI術語表示並顯示(某些僅有歷史意義)。
圖例
符號
定義
≡
嚴格等於
≈
近似等於
數字
表示數字無限循環(例如8.294369表示8.294369369369369…)
(H)
過去使用
長度編輯
長度
單位名稱
符號
定義
與SI單位的關係
埃
Å
≡
1
×
10
−
10
{\displaystyle1\times10^{-10}}
m
≡0.1 nm
天文單位
AU
≡149597870700 m≈地球與太陽之間的距離
≡149597870700 m[1]Barleycorn(H)
=
1
3
{\displaystyle{\frac{1}{3}}}
in(參見上面關於捨入的說明)
≈
8.4
6
¯
×
10
−
3
{\displaystyle8.4{\overline{6}}\times10^{-3}}
m
玻爾,原子長度單位
a0
≡氫的玻爾半徑
≈
5.291
772
085
9
×
10
−
11
±
3.6
×
10
−
20
{\displaystyle5.291\772\085\9\times10^{-11}\pm3.6\times10^{-20}}
m[2]鏈(英制)(cablelength)
≡608ft
≈185.3184m
鏈(國際)(cablelength)
≡
1
10
{\displaystyle{\frac{1}{10}}}
海里
≡185.2m
鏈(美國)(cablelength)
≡720英尺
=219.456m
測鏈(chain)
ch
≡66英尺(美國)≡4竿(單位)[3]
≈7001201168400000000♠20.11684 米
腕尺、肘(cubit)(H)
≡從手指到肘部的距離≈18in
≈0.5m
厄爾(H)
ell
≡45in[4](通常在英格蘭使用)
=1.143m
噚
fm
≡6 ft[4]
=1.8288m
飛米
fm
≡6985100000000000000♠1×10−15 米[4]
≡6985100000000000000♠1×10−15 米
finger(長度單位)
≡
7
8
{\displaystyle{\frac{7}{8}}}
in
=6998222250000000000♠0.022225 米
finger(長度單位)(服裝)
≡
4
1
2
{\displaystyle4{\frac{1}{2}}}
in
=0.1143m
英尺(Benoît)(H)
ft(Ben)
≈6999304799735000000♠0.304799735 米
英尺(Cape)(H)
於1859年由法律規定為1.033英國英尺
≈6999314858000000000♠0.314858 米
英尺(Clarke's)(H)
ft(Cla)
≈6999304797265400000♠0.3047972654 米
英尺(印度)(H)
ftInd
≈6999304799514000000♠0.304799514 米
英尺(國際)
ft
≡0.3048m≡
1
3
{\displaystyle{\frac{1}{3}}}
yd≡12 英寸
≡0.3048m
英尺(Sear's)(H)
ft(Sear)
≈6999304799470000000♠0.30479947 米
英尺(美國測量)
ft(美國)
≡
1200
3937
{\displaystyle{\frac{1200}{3937}}}
m[5]
≈6999304800610000000♠0.304800610 米
french;charriere
F
≡
1
3
{\displaystyle{\frac{1}{3}}}
mm
=
0.
3
¯
×
10
−
3
{\displaystyle0.{\overline{3}}\times10^{-3}}
m
浪
fur
≡10測鏈=660 ft=220yd[4]
=201.168m
hand
≡4in[4]
≡0.1016m
英寸(國際)
in
≡2.54 cm≡
1
36
{\displaystyle{\frac{1}{36}}}
yd≡
1
12
{\displaystyle{\frac{1}{12}}}
ft
≡0.0254m
里格(land)
lea
≡3美制英里[3]
=4828.032m
光日
≡24光時
≡7013259020683712000♠2.59020683712×1013 米
光時
≡60光分
≡7012107925284880000♠1.0792528488×1012 米
光分
≡60光秒
≡7010179875474800000♠1.798754748×1010 米
光秒
≡光在真空中1秒走過的距離
≡299792458m
光年
ly
≡光在真空中365.25天走過的距離[6]
=7015946073047258080♠9.4607304725808×1015 米
line
ln
≡
1
12
{\displaystyle{\frac{1}{12}}}
in[7]
=
0.002
11
6
¯
{\displaystyle0.002\11{\overline{6}}}
m
link(Gunter's;Surveyor's)
lnk
≡
1
100
{\displaystyle{\frac{1}{100}}}
ch[4]≡0.66 ft≡7.92in測鏈(chain)上組成鏈的環節(link),下同
=6999201168000000000♠0.201168 米
link(Ramsden's;Engineer's)
lnk
≡1 ft[4]
=0.3048m
米(國際單位制基本單位)
m
≡光在真空中
1
299
792
458
{\displaystyle{\frac{1}{299\792\458}}}
秒走過的距離[8]≈赤道至南極點或北極點距離的
1
100
000
00
{\displaystyle{\frac{1}{100\000\00}}}
≡1m
mickey
≡
1
200
{\displaystyle{\frac{1}{200}}}
in
=6996127000000000000♠1.27×10−4 米
微米
µ
≡6994100000000000000♠1×10−6 米
密耳(mil;thou)
mil
≡6995254000000000000♠1×10−3 英寸
≡6995254000000000000♠2.54×10−5 米
挪威/瑞典密耳
mil
≡10 km
=10000m
地理英里(H)
≡6082ft
=1853.7936m
英里(國際)
mi
≡80測鏈≡5280ft≡1760yd
≡1609.344m
英里(戰術或數據)
≡6000 ft
≡1828.8 m
英里(電報)(H)
mi
≡6087ft
=1855.3176m
英里(美國測量)
mi
≡5280美國測量英尺≡(
5280
×
1200
3937
{\displaystyle5280\times{\frac{1200}{3937}}}
)m
≈1609.347219m
nail(服裝)
≡
2
1
4
{\displaystyle2{\frac{1}{4}}}
in[4]
=0.05715m
奈米
nm
≡6991100000000000000♠1×10−9 米
≡6991100000000000000♠1×10−9 米
海里格(nauticalleague)
NL;nl
≡3nmi[4]
=5556m
海里(Admiralty)
NM(Adm);nmi(Adm)
=6080ft
=1853.184m
海里(國際)
NM;nmi
≡1852m[9]
≡1852m
海里(美國1954年前)
≡1853.248m
≡1853.248m
pace
≡2.5 ft[4]
=0.762m
plam
≡3in[4]
=0.0762m
秒差距
pc
與一個天文單位為一弧秒視差移位的恆星距離
≈
3.085
677
82
×
10
16
±
6
×
10
6
{\displaystyle3.085\677\82\times10^{16}\pm6\times10^{6}}
m[10]皮卡、派卡(pica)
≡12點
由點量度決定。
點(美英)[11][12]
pt
≡
1
72.272
{\displaystyle{\frac{1}{72.272}}}
in
≈0.000351450m
點(Didot;歐洲)[12][13]
pt
≡
1
12
×
1
72
{\displaystyle{\frac{1}{12}}\times{\frac{1}{72}}}
ofpiedduroi;1878年後:≡
5
133
{\displaystyle{\frac{5}{133}}}
cm
≈0.00037597m;1878年後:≈0.00037593985m
點(PostScript)[11]
pt
≡
1
72
{\displaystyle{\frac{1}{72}}}
in
=
0
,
000
352
7
¯
{\displaystyle0,000\352\{\overline{7}}}
m
點(TeX)[11]
pt
≡
1
72.27
{\displaystyle{\frac{1}{72.27}}}
in
=
0.00
0
351
459
8
¯
{\displaystyle0.00{\overline{0\351\459\8}}}
m
quarter
≡
1
4
{\displaystyle{\frac{1}{4}}}
yd
=0.2286m
杆(rod;pole;perch)(H)
rd
≡
16
1
2
{\displaystyle16{\frac{1}{2}}}
ft
=5.0292m
Rope(H)
rope
≡20 ft[4]
=6.096m
span(H)
≡9in[4]
=0.2286m
spat[14]
≡1×1012m
stick(H)
≡2in
=0.0508m
stigma;bicron(皮米)
pm
≡1×10−12m
緹(twip)
twp
≡
1
1440
{\displaystyle{\frac{1}{1440}}}
in
=
1.763
8
¯
×
10
−
5
{\displaystyle1.763{\overline{8}}\times10^{-5}}
m
xunit;siegbahn
xu
≈1.0021×10−13m[4]碼(國際)
yd
≡0.9144m[5]≡3 ft≡36in
≡0.9144m
面積編輯
面積
單位名稱
符號
定義
與SI單位的關係
英畝(國際)
ac
≡1浪×1鏈=4840平方碼
≡4046.8564224m2英畝(美國測量)
ac
≡10sqch=4840平方碼或43560平方呎
≈4046.873m2[15]公畝
a
≡100m2
=100m2靶恩
b
≡10−28m2
=10−28m2barony
≡4000ac
≈1.618742×107m2board
bd
≡1in×1 ft
=7.74192×10−3m2boilerhorsepowerequivalentdirectradiation
bhpEDR
≡
(
1
ft
2
)
(
1
bhp
)
(
240
BTU
IT
/
h
)
{\displaystyle{\frac{(1\{\text{ft}}^{2})(1\{\text{bhp}})}{(240\{\text{BTU}}_{\text{IT}}/{\text{h}})}}}
≈12.958174m2圓英寸
circin
≡
π
4
{\displaystyle{\frac{\pi}{4}}}
sqin
≈5.067075×10−4m2圓密耳
circmil
≡
π
4
{\displaystyle{\frac{\pi}{4}}}
mil2
≈5.067075×10−10m2cord
≡192bd
=1.48644864m2dunam
≡1000m2
=1000m2guntha
≡121sqyd
≈101.17m2公頃
ha
≡10000m2
≡10000m2hide
≈120ac(variable)
≈5×105m2rood
ro
≡
1
4
{\displaystyle{\frac{1}{4}}}
ac
=1011.7141056m2section
≡1 mi×1 mi
=2.589988110336×106m2shed
≡10−52m2
=10−52m2square(roofing)
≡10 ft×10 ft
=9.290304m2平方測鏈(國際)
sqch
≡66 ft×66 ft=1/10ac
≡404.68564224m2平方測鏈(美國測量)
sqch
≡66 ft(美國)×66 ft(美國)=
1
10
{\displaystyle{\frac{1}{10}}}
ac
≈404.6873m2平方英尺
sqft
≡1 ft×1 ft
≡9.290304×10−2m2平方英尺(美國測量)
sqft
≡1 ft(美國)×1 ft(美國)
≈9.29034116132749×10-2m2平方英寸
sqin
≡1in×1in
≡6.4516×10−4m2平方千米
km2
≡1 km×1 km
=106m2squarelink(Gunter's)(國際)
sqlnk
≡1lnk×1lnk≡0.66 ft×0.66 ft
=4.0468564224×10−2m2squarelink(Gunter's)(USSurvey)
sqlnk
≡1lnk×1lnk≡0.66 ft(美國)×0.66 ft(美國)
≈4.046872×10−2m2squarelink(Ramsden's)
sqlnk
≡1lnk×1lnk≡1 ft×1 ft
=0.09290304m2平方公尺(SIunit)
m2
≡1m×1m
=1m2平方密爾
sqmil
≡1mil×1mil
=6.4516×10−10m2平方英里
sqmi
≡1 mi×1 mi
=2.589988110336×106m2平方英里(美國測量)
sqmi
≡1 mi(美國)×1 mi(美國)
≈2.58999847×106m2squarerod/pole/perch
sqrd
≡1rd×1rd
=25.29285264m2平方碼(國際)
sqyd
≡1yd×1yd
≡0.83612736m2stremma
≡1000m2
=1000m2township
≡36sqmi(美國)
≈9.323994×107m2yardland
≈30ac
≈1.2×105m2體積編輯
體積
單位
符號
定義
與SI單位的關係
英畝英尺
acft
≡1acx1 ft=43560ft3
=1233.48183754752m3英畝-英寸
≡1ac×1in
=102.79015312896m3barrel(英制)
bl(imp)
≡36gal(imp)
=0.16365924m3barrel(petroleum)
bl;bbl
≡42gal(美國)
=0.158987294928m3barrel(USdry)
bl(美國)
≡105qt(美國)=
105
32
{\displaystyle{\frac{105}{32}}}
bu(USlvl)
=0.115628198985075m3barrel(USfluid)
flbl(美國)
≡
31
1
2
{\displaystyle31{\frac{1}{2}}}
gal(美國)
=0.119240471196m3board-foot
fbm
≡144cuin
≡2.359737216×10−3m3bucket(英制)
bkt
≡4gal(imp)
=0.01818436m3bushel(英制)
bu(imp)
≡8gal(imp)
=0.03636872m3bushel(USdryheaped)
bu(美國)
≡
1
1
4
{\displaystyle1{\frac{1}{4}}}
bu(USlvl)
=0.0440488377086m3bushel(USdrylevel)
bu(USlvl)
≡2150.42cuin
=0.03523907016688m3butt,pipe
≡126gal(wine)
=0.476961884784m3coomb
≡4bu(imp)
=0.14547488m3cord(firewood)
≡8 ft×4 ft×4 ft
=3.624556363776m3cord-foot
≡16cuft
=0.453069545472m3立方英尋
cufm
≡1fm×1fm×1fm
=6.116438863872m3立方英尺
cuft
≡1 ft×1 ft×1 ft
≡0.028316846592m3立方英寸
cuin
≡1in×1in×1in
≡16.387064×10−6m3立方米(SI單位)
m3
≡1m×1m×1m
≡1m3立方英里
cumi
≡1 mi×1 mi×1 mi
≡4168181825.440579584m3立方碼
cuyd
≡27cuft
≡0.764554857984m3杯(breakfast)
≡10floz(imp)
=284.130625×10−6m3杯(加拿大)
c(CA)
≡8floz(imp)
=227.3045×10−6m3cup(公制)
c
≡250.0×10−6m3
=250.0×10−6m3cup(UScustomary)
c(美國)
≡8USfloz≡
1
16
{\displaystyle{\frac{1}{16}}}
gal(美國)
=236.5882365×10−6m3杯(美國食品營養標籤)
c(美國)
≡240 mL[16]
=6996240000000000000♠2.4×10−4 m3
dash(英制)
≡
1
384
{\displaystyle{\frac{1}{384}}}
gi(imp)=
1
2
{\displaystyle{\frac{1}{2}}}
pinch(imp)
=
396.961
751
302
08
3
¯
×
10
−
9
{\displaystyle396.961\751\302\08{\overline{3}}\times10^{-9}}
m3dash(美國)
≡
1
96
{\displaystyle{\frac{1}{96}}}
USfloz=
1
2
{\displaystyle{\frac{1}{2}}}
USpinch
=308.057599609375×10−9m3dessertspoon(英制)
≡
1
12
{\displaystyle{\frac{1}{12}}}
gi(imp)
=
11.838
776
041
6
¯
×
10
−
6
{\displaystyle11.838\776\041{\overline{6}}\times10^{-6}}
m3drop(英制)
gtt
≡
1
288
{\displaystyle{\frac{1}{288}}}
floz(imp)
=
98.656
467
013
8
¯
×
10
−
9
{\displaystyle98.656\467\013\{\overline{8}}\times10^{-9}}
m3drop(英制)(alt)
gtt
≡
1
1824
{\displaystyle{\frac{1}{1824}}}
gi(imp)
≈77.886684×10−9m3drop(medical)
≡
0.9964
12
{\displaystyle{\frac{0.9964}{12}}}
ml
=
83.0
3
¯
×
10
−
9
{\displaystyle83.0{\overline{3}}\times10^{-9}}
m3drop(medical)
≡
1
12
{\displaystyle{\frac{1}{12}}}
ml
=
83.
3
¯
×
10
−
9
{\displaystyle83.{\overline{3}}\times10^{-9}}
m3drop(公制)
≡
1
20
{\displaystyle{\frac{1}{20}}}
mL
=50.0×10−9m3drop(美國)
gtt
≡
1
360
{\displaystyle{\frac{1}{360}}}
USfloz
=
82.148
693
229
16
¯
×
10
−
9
{\displaystyle82.148\693\229\{\overline{16}}\times10^{-9}}
m3drop(美國)(alt)
gtt
≡
1
456
{\displaystyle{\frac{1}{456}}}
USfloz
≈64.85423149671×10−9m3drop(美國)(alt)
gtt
≡
1
576
{\displaystyle{\frac{1}{576}}}
USfloz
≈51.34293326823×10−9m3fifth
≡
1
5
{\displaystyle{\frac{1}{5}}}
USgal
=757.0823568×10−6m3firkin
≡9gal(美國)
=0.034068706056m3fluiddrachm(英制)
fldr
≡
1
8
{\displaystyle{\frac{1}{8}}}
floz(imp)
=3.5516328125×10−6m3fluiddram(美國);USfluidram
fldr
≡
1
8
{\displaystyle{\frac{1}{8}}}
USfloz
=3.6966911953125×10−6m3fluidscruple(英制)
fls
≡
1
24
{\displaystyle{\frac{1}{24}}}
floz(imp)
=
1.183
877
604
1
6
¯
×
10
−
6
{\displaystyle1.183\877\604\1{\overline{6}}\times10^{-6}}
m3gallon(beer)
beergal
≡282cuin
=4.621152048×10−3m3gallon(英制)
gal(imp)
≡4.546 09L
≡4.54609×10−3m3gallon(USdry)
gal(美國)
≡
1
8
{\displaystyle{\frac{1}{8}}}
bu(USlvl)
=4.40488377086×10−3m3gallon(USfluid;Wine)
gal(美國)
≡231cuin
≡3.785411784×10−3m3gill(英制);Noggin
gi(imp);nog
≡5floz(imp)
=142.0653125×10−6m3gill(美國)
gi(美國)
≡4USfloz
=118.29411825×10−6m3hogshead(英制)
hhd(imp)
≡2bl(imp)
=0.32731848m3hogshead(美國)
hhd(美國)
≡2flbl(美國)
=0.238480942392m3jigger(bartending)
≡
1
1
2
{\displaystyle1{\frac{1}{2}}}
USfloz
≈44.36×10−6m3kilderkin
≡18gal(imp)
=0.08182962m3lambda
λ
≡1 mm3
=1×10−9m3last
≡80bu(imp)
=2.9094976m3litre
L
≡1dm3[17]
≡0.001m3load
≡50cuft
=1.4158423296m3minim(英制)
min
≡
1
480
{\displaystyle{\frac{1}{480}}}
floz(imp)=
1
60
{\displaystyle{\frac{1}{60}}}
fldr(imp)
=59.1938802083×10−9m3minim(美國)
min
≡
1
480
{\displaystyle{\frac{1}{480}}}
USfloz=
1
60
{\displaystyle{\frac{1}{60}}}
USfldr
=61.611519921875×10−9m3盎司(英制)
floz(imp)
≡
1
160
{\displaystyle{\frac{1}{160}}}
gal(imp)
≡28.4130625×10−6m3盎司(美制)
USfloz
≡
1
128
{\displaystyle{\frac{1}{128}}}
gal(美國)
≡29.5735295625×10−6m3盎司(fluidUSfoodnutritionlabeling)
USfloz
≡30 mL[16]
≡6995300000000000000♠3×10−5 m3
peck(英制)
pk
≡2gal(imp)
=9.09218×10−3m3peck(USdry)
pk
≡
1
4
{\displaystyle{\frac{1}{4}}}
USlvlbu
=8.80976754172×10−3m3perch
per
≡
16
1
2
{\displaystyle16{\frac{1}{2}}}
ft×
1
1
2
{\displaystyle1{\frac{1}{2}}}
ft×1 ft
=0.700841953152m3pinch(英制)
≡
1
192
{\displaystyle{\frac{1}{192}}}
gi(imp)=
1
8
{\displaystyle{\frac{1}{8}}}
tsp(imp)
=739.92350260416×10−9m3pinch(美國)
≡
1
48
{\displaystyle{\frac{1}{48}}}
USfloz=
1
8
{\displaystyle{\frac{1}{8}}}
UStsp
=616.11519921875×10−9m3pint(英制)
pt(imp)
≡
1
8
{\displaystyle{\frac{1}{8}}}
gal(imp)
=568.26125×10−6m3pint(USdry)
pt(USdry)
≡
1
64
{\displaystyle{\frac{1}{64}}}
bu(USlvl)≡
1
8
{\displaystyle{\frac{1}{8}}}
gal(USdry)
=550.6104713575×10−6m3pint(USfluid)
pt(USfl)
≡
1
8
{\displaystyle{\frac{1}{8}}}
gal(美國)
=473.176473×10−6m3pony
≡
3
4
{\displaystyle{\tfrac{3}{4}}}
USfloz
=22.180147171875×10−6m3pottle;quartern
≡
1
2
{\displaystyle{\frac{1}{2}}}
gal(imp)=80floz(imp)
=2.273045×10−3m3quart(英制)
qt(imp)
≡
1
4
{\displaystyle{\frac{1}{4}}}
gal(imp)
=1.1365225×10−3m3quart(USdry)
qt(美國)
≡
1
32
{\displaystyle{\frac{1}{32}}}
bu(USlvl)=
1
4
{\displaystyle{\frac{1}{4}}}
gal(USdry)
=1.101220942715×10−3m3quart(USfluid)
qt(美國)
≡
1
4
{\displaystyle{\frac{1}{4}}}
gal(USfl)
=946.352946×10−6m3quarter;pail
≡8bu(imp)
=0.29094976m3registerton
≡100cuft
=2.8316846592m3sack(英制);bag
≡3bu(imp)
=0.10910616m3[來源請求]sack(美國)
≡3bu(USlvl)
=0.10571721050064m3seam
≡8bu(USlvl)
=0.28191256133504m3[來源請求]shot
≡1USfloz
≈29.57×10−6m3strike(英制)
≡2bu(imp)
=0.07273744m3strike(美國)
≡2bu(USlvl)
=0.07047814033376m3tablespoon(Australianmetric)
≡20.0×10−6m3tablespoon(Canadian)
tbsp
≡
1
2
{\displaystyle{\frac{1}{2}}}
floz(imp)
=14.20653125×10−6m3tablespoon(英制)
tbsp
≡
5
8
{\displaystyle{\frac{5}{8}}}
floz(imp)
=17.7581640625×10−6m3tablespoon(公制)
≡15.0×10−6m3tablespoon(UScustomary)
tbsp
≡
1
2
{\displaystyle{\frac{1}{2}}}
USfloz
=14.7867647825×10−6m3tablespoon(USfoodnutritionlabeling)
tbsp
≡15 mL[16]
=6995150000000000000♠1.5×10−5 m3
teaspoon(Canadian)
tsp
≡
1
16
{\displaystyle{\frac{1}{16}}}
floz(imp)
=4.735510416×10−6m3teaspoon(英制)
tsp
≡
1
24
{\displaystyle{\frac{1}{24}}}
gi(imp)
=5.91938802083×10−6m3teaspoon(公制)
≡5.0×10−6m3
=5.0×10−6m3teaspoon(UScustomary)
tsp
≡
1
6
{\displaystyle{\frac{1}{6}}}
USfloz
=4.928921595×10−6m3teaspoon(USfoodnutritionlabeling)
tsp
≡5 mL[16]
=6994499999999999999♠5×10−6 m3
timberfoot
≡1cuft
=0.028316846592m3ton(displacement)
≡35cuft
=0.99108963072m3ton(freight)
≡40cuft
=1.13267386368m3ton(water)
≡28bu(imp)
=1.01832416m3tun
≡252gal(wine)
=0.953923769568m3wey(美國)
≡40bu(USlvl)
=1.4095628066752m3平面角編輯
平面角
單位名稱
符號
定義
與SI單位的關係
角密耳
µ
≡
2
π
6400
{\displaystyle{\frac{2\pi}{6400}}}
rad
≈0.981748×10-3rad
弧分;MOA
'
≡
1
∘
60
{\displaystyle{\frac{1^{\circ}}{60}}}
≈0.290888×10-3rad
弧秒
"
≡
1
∘
3600
{\displaystyle{\frac{1^{\circ}}{3600}}}
≈4.848137×10-6rad
centesimalminuteofarc
'
≡1梯度/100
≈0.157080×10-3rad
centesimalsecondofarc
"
≡1梯度/(10000)
≈1.570796×10-6rad
degree(ofarc)
°
≡
1
360
{\displaystyle{\frac{1}{360}}}
圓周≡
π
180
{\displaystyle{\frac{\pi}{180}}}
rad
≈17.453293×10-3rad
梯度(角);gradian;gon
grad
≡
1
400
{\displaystyle{\frac{1}{400}}}
圓周≡
2
π
400
{\displaystyle{\frac{2\pi}{400}}}
rad≡0.9°
≈15.707963×10-3rad
八分之一圓
≡45°
≈0.785398rad
象限
≡90°
≈1.570796rad
弧度(SI單位)
rad
Theanglesubtendedatthecenterofacirclebyanarcwhoselengthisequaltothecircle'sradius.Onefullrevolutionencompasses2πradians.
=1rad
六分之一圓
≡60°
≈1.047198rad
sign
≡30°
≈0.523599rad
立體角編輯
立體角
單位名稱
符號
定義
與SI的關係
球面度(SI單位)
sr
立體角subtendedatthecenterofasphereofradiusrbyaportionofthesurfaceofthespherehavinganarear2.Asphereencompasses4πsr.[14]
=1sr
質量編輯
Notes:
查看重量條目以獲取關於質量/重量的區別和換算方法。
Avoirdupoisisasystemofmassbasedonapoundof16ounces,whileTroyweightisthesystemofmasswhere12troyouncesequalsonetroypound.
Inthistable,theunitgeeisusedtodenotestandardgravityinordertoavoidconfusionwiththe"g"symbolforgrams.
在物理學中,thepoundofmassissometimeswrittenlbmtodistinguishitfromthepound-force(lbf).Itshouldnotbereadasthemongrelunit"poundmetre".質量
單位名稱
符號
定義
與SI單位的關係
牛股(cowton)
ctn
0.9487t=1ctn
atomicmassunit,unified
u;AMU
≈1.66053873×10−27±1.3×10−36kg
atomicunitofmass,electronrestmass
me
≈9.10938215×10−31±45×10−39kg[18]bag(coffee)
≡60 kg
=60 kg
bag(Portlandcement)
≡94 lbav
=42.63768278kg
barge
≡
22
1
2
{\displaystyle22{\frac{1}{2}}}
shtn
=20411.65665kg
carat
kt
≡
3
1
6
{\displaystyle3{\frac{1}{6}}}
gr
≈205.196548333mg
carat(公制)
ct
≡200 mg
=200 mg
clove
≡8 lbav
=3.62873896kg
crith
≈89.9349 mg
dalton
Da
≈1.66090210×10−27±1.3×10−36kg
dram(apothecary;troy)
drt
≡60gr
=3.8879346g
dram(avoirdupois)
drav
≡
22
11
32
{\displaystyle22{\frac{11}{32}}}
gr
=1.7718451953125g
electronvolt
eV
≡1eV(energyunit)/c2
=1.7826×10-36kg
gamma
γ
≡1μg
=1μg
grain
gr
≡
1
7000
{\displaystyle{\frac{1}{7000}}}
lbav
≡64.79891mg
grave
G
grave是千克的原名
≡1 kg
英擔(長)
longcwtorcwt
≡112 lbav
=50.80234544kg
英擔(短)、百磅
shcwt
≡100 lbav
=45.359237kg
千克
kg
≡massoftheprototypenearParis(≈massof1Lofwater)
≡1 kg(SIbaseunit)[8]kip
kip
≡1000lbav
=453.59237kg
mark
≡8ozt
=248.8278144g
mite
≡
1
20
{\displaystyle{\frac{1}{20}}}
gr
=3.2399455mg
mite(公制)
≡
1
20
{\displaystyle{\frac{1}{20}}}
g
=50 mg
金衡盎司
ozt
≡
1
12
{\displaystyle{\frac{1}{12}}}
lbt
=31.1034768g
常衡盎司
ozav
≡
1
16
{\displaystyle{\frac{1}{16}}}
lb
=28.349523125g
盎司(美國食品標籤)
oz
≡28 g[16]
=28 g
英錢
dwt;pwt
≡
1
20
{\displaystyle{\frac{1}{20}}}
ozt
=1.55517384g
point
≡
1
100
{\displaystyle{\frac{1}{100}}}
ct
=2 mg
磅
lb
≡slug·ft/s2
=0.45359237kg
常衡磅
lbav
≡0.45359237kg=7000grains
≡0.45359237kg
公制磅
≡500g
=500g
金衡磅
lbt
≡5760grains
=0.3732417216kg
quarter(英制)
≡
1
4
{\displaystyle{\frac{1}{4}}}
longcwt=2st=28 lbav
=12.70058636kg
quarter(非正式)
≡
1
4
{\displaystyle{\frac{1}{4}}}
shorttn
=226.796185kg
quarter,long(非正式)
≡
1
4
{\displaystyle{\frac{1}{4}}}
longtn
=254.0117272kg
quintal(公制)
q
≡100 kg
=100 kg
scruple(apothecary)
sap
≡20gr
=1.2959782g
sheet
≡
1
700
{\displaystyle{\frac{1}{700}}}
lbav
=647.9891 mg
slug;geepound;hyl
slug
≡1gee×1 lbav×1s2/ft
≈14.593903kg
stone
st
≡14 lbav
=6.35029318kg
ton,assay(long)
AT
≡1 mg×1longtn÷1ozt
≈32.666667g
ton,assay(short)
AT
≡1 mg×1shtn÷1ozt
≈29.166667g
長噸
longtnorton
≡2240lb
=1016.0469088kg
短噸
shtn
≡2000lb
=907.18474kg
tonne(mtsunit)
t
≡1000kg
=1000kg
wey
≡252 lb=18st
=114.30527724kg(variantsexist)
Zentner
Ztr.
Definitionsvary;see[19]and.[14]
密度編輯
密度
單位名稱
符號
定義
與SI單位的關係
克每毫升
g/mL
≡g/mL
=7003100000000000000♠1000 kg/m3
千克每立方米(SI單位)
kg/m3
≡kg/m3
=1 kg/m3千克每升
kg/L
≡kg/L
=7003100000000000000♠1000 kg/m3
盎司(avoirdupois)每立方英尺
oz/ft3
≡oz/ft3
≈7000100115396100000♠1.001153961 kg/m3
盎司(avoirdupois)每立方英寸
oz/in3
≡oz/in3
≈7003172999404399999♠1.729994044×103 kg/m3
盎司(avoirdupois)每加侖(英制)
oz/gal
≡oz/gal
≈7000623602329100000♠6.236023291 kg/m3
盎司(avoirdupois)每加侖(美國容積)
oz/gal
≡oz/gal
≈7000748915170700000♠7.489151707 kg/m3
磅(avoirdupois)每立方英尺
lb/ft3
≡lb/ft3
≈7001160184633700000♠16.01846337 kg/m3
磅(avoirdupois)每立方英寸
lb/in3
≡lb/in3
≈7004276799047100000♠2.767990471×104 kg/m3
磅(avoirdupois)每加侖(英制)
lb/gal
≡lb/gal
≈7001997763726600000♠99.77637266 kg/m3
磅(avoirdupois)每加侖(美國容積)
lb/gal
≡lb/gal
≈7002119826427300000♠119.8264273 kg/m3
slugpercubicfoot
slug/ft3
≡slug/ft3
≈7002515378818400000♠515.3788184 kg/m3
時間編輯
時間
單位名稱
符號
定義
與SI單位的關係
atomicunitoftime
au
≡a0/(α·c)
≈2.418884254×10−17s
蔀
≡指回歸年與朔望月與太陽日的最短循環=76年
=2.3983776×109s
世紀
c
≡100a(參見下方年的長度定義)
=100年
日(天)
d
=24h
=1440min=86400s
恆星日
d
≡是地球上某點對某個恆星連續兩次經過其上中天的時間間隔(國際天球參考框架)
≈86164.1s
年代
dec
≡10a(seebelowfordefinitionofyearlength)
=10年
fortnight
fn
≡2周
=1209600s
helek(希伯來曆)
≡
1
1080
{\displaystyle{\frac{1}{1080}}}
h
=3.3s
Hipparchiccycle
≡4Callippiccycles-1d
=9.593424×109s
小時
h
≡60min
=3600s
jiffy
j
≡
1
60
{\displaystyle{\frac{1}{60}}}
s
=.016s
jiffy(alternate)
ja
≡
1
100
{\displaystyle{\frac{1}{100}}}
s
=10ms
刻(鍾)(四分之一小時)
≡
1
4
{\displaystyle{\frac{1}{4}}}
h=
1
96
{\displaystyle{\frac{1}{96}}}
d
=
60
×
60
4
{\displaystyle60\times{\frac{60}{4}}}
s=900s=
60
4
{\displaystyle{\frac{60}{4}}}
min=15min
刻(鍾)(舊制)(traditional)
≡
1
100
{\displaystyle{\frac{1}{100}}}
d
=
24
×
60
×
60
100
{\displaystyle24\times60\times{\frac{60}{100}}}
s=864s=
24
×
60
100
{\displaystyle24\times{\frac{60}{100}}}
min=14.4min
lustre;lustrum
≡5aof365d
=1.5768×108s
章_(曆法);
≡110mo(hollow)+125mo(full)=6940d≈19a
=5.99616×108s
千年
≡1000a(seebelowfordefinitionofyearlength)
=1000年
beat
md
≡
1
1000
{\displaystyle{\frac{1}{1000}}}
d
=
24
×
60
×
60
1000
{\displaystyle24\times60\times{\frac{60}{1000}}}
s=86.4s
分鐘
min
≡60s,duetoleapsecondssometimes59sor61s,
=60s
moment
≡90s
=90s
月(full)
mo
≡30d[20]
=2592000s
月(Greg.av.)
mo
AverageGregorianmonth=1a(Gregorianaverage)/12=365.2425d/12=30.436875d
≈2.6297×106s
月(hollow)
mo
≡29d[20]
=2505600s
朔望月
mo
Cycletimeofmoonphases≈29.530589d(Average)
≈2.551×106s
octaeteris
=48mo(full)+48mo(hollow)+3mo(full)[21][22]=8aof365.25d=2922d
=2.524608×108s
Plancktime
≡(Gℏ/c5)½
≈1.351211868×10−43s
秒
s
銫133原子基態的兩個超精細能階間躍遷對應輻射的9,192,631,770個週期的持續時間[8](butothersecondsaresometimesusedinastronomy)
(SIbaseunit)
shake
≡10−8s
=10ns
sigma
≡10−6s
=1μs
Sothiccycle
≡1461aof365d
=4.6074096×1010s
svedberg
S
≡10−13s
=100fs
周
wk
≡7d
=168h=10080min=604800s
年(公曆)
a,y,oryr
=365.2425daverage,calculatedfromcommonyears(365d)plusleapyears(366d)onmostyearsdivisibleby4.Seeleapyearfordetails.
=31556952s
年(儒略曆)
a,y,oryr
=365.25daverage,calculatedfromcommonyears(365d)plusoneleapyear(366d)everyfouryears
=31557600s
恆星年
a,y,oryr
≡timetakenforSuntoreturntothesamepositionwithrespecttothestarsofthecelestialsphere
≈365.256363d≈31558149.7632s
回歸年
a,y,oryr
≡LengthoftimeittakesfortheSuntoreturntothesamepositioninthecycleofseasons
≈365.242190d≈31556925s
旬
=10d
WhereUTCisobserved,thelengthoftimeunitslongerthan1smayincreaseordecreaseby1sifaleapsecondoccursduringthetimeintervalofinterest.
頻率編輯
頻率
單位名稱
符號
定義
與SI單位的關係
hertz(SIunit)
Hz
≡Numberofcyclespersecond
=1 Hz=1/s
每分鐘轉數
rpm
≡Oneunitrpmequalsonerotationcompletedaroundafixedaxisinoneminuteoftime.
≈6999104719755000000♠0.104719755 rad/s
速度或速率編輯
速度
單位名稱
符號
定義
與SI單位的關係
英尺每小時
fph
≡1 ft/h
≈8.466667×10−5m/s
英尺每分鐘
fpm
≡1 ft/min
=5.08×10−3m/s
英尺每秒
fps
≡1 ft/s
=3.048×10−1m/s
furlongperfortnight
≡furlong/fortnight
≈1.663095×10−4m/s
英寸每小時
iph
≡1in/hr
≈7.05556×10−6m/s
英寸每分鐘
ipm
≡1in/min
≈4.23333×10−4m/s
英寸每秒
ips
≡1in/s
=2.54×10−2m/s
千米每小時
km/h
≡1 km/h
=
1
3.6
{\displaystyle{\frac{1}{3.6}}}
m/s≈2.777778×10−1m/s
節
kn,kt
≡1NM/h=1.852 km/h
≈0.514444m/s
節(Admiralty)
kn
≡1NM(Adm)/h=1.853184km/h[來源請求]
=0.514773m/s
馬赫
M
Ratioofthespeedtothespeedofsoundinthemedium.Variesespeciallywithtemperature.About1225 km/h(761 mph)inairatsealeveltoabout1062 km/h(660 mph)atjetaltitudes(12,200公尺(40,000英尺)).[23]Unitless
≈340to295 m/sforaircraft
metrepersecond(SIunit)
m/s
≡1 m/s
=1 m/s
英里每小時
mph
≡1 mi/h
=0.44704m/s
英里每分鐘
mpm
≡1 mi/min
=26.8224 m/s
英里每秒
mps
≡1 mi/s
=1609.344m/s
真空光速
c
≡299792458m/s
=299792458m/s
空氣音速
s
Variesespeciallywithtemperature.About1225 km/h(761 mph)inairatsealeveltoabout1062 km/h(660 mph)atjetaltitudes.
≈340to295 m/sataircraftaltitudes
Avelocityconsistsofaspeedcombinedwithadirection;thespeedpartofthevelocitytakesunitsofspeed.
流量(容積)編輯
流量
單位名稱
符號
定義
與SI單位的關係
立方英尺每分鐘
CFM[來源請求]
≡1 ft3/min
=6996471947443200000♠4.719474432×10−4 m3/s
立方英尺每秒
ft3/s
≡1 ft3/s
=6998283168465920000♠0.028316846592 m3/s
立方英寸每分鐘
in3/min
≡1in3/min
=7000273117700000000♠2.7311773×10-7 m3/s
立方英寸每秒
in3/s
≡1in3/s
=6995163870640000000♠1.6387064×10−5 m3/s
立方米每秒(SI單位)
m3/s
≡1m3/s
=1m3/s
加侖(美國容積)每日
GPD[來源請求]
≡1gal/d
=7000438126363000000♠4.381263638×10-8 m3/s
加侖(美國容積)每小時
GPH[來源請求]
≡1gal/h
=7000105150327000000♠1.051503273×10-6 m3/s
加侖(美國容積)每分鐘
GPM[來源請求]
≡1gal/min
=6995630901964000000♠6.30901964×10−5 m3/s
升每分鐘
LPM[來源請求]
≡1L/min
=1.6×10-5m3/s
加速度編輯
加速度
Nameofunit
Symbol
Definition
RelationtoSIunits
footperhourpersecond
fph/s
≡1 ft/(h·s)
≈8.466667×10−5m/s2footperminutepersecond
fpm/s
≡1 ft/(min·s)
=5.08×10−3m/s2英尺每二次方秒
fps2
≡1 ft/s2
=3.048×10−1m/s2gal;galileo
Gal
≡1 cm/s2
=10−2m/s2inchperminutepersecond
ipm/s
≡1in/(min·s)
≈4.233333×10−4m/s2英寸每二次方秒
ips2
≡1in/s2
=2.54×10−2m/s2knotpersecond
kn/s
≡1kn/s
≈5.144444×10−1m/s2米每二次方秒(SI)
m/s2
≡1 m/s2
=1 m/s2mileperhourpersecond
mph/s
≡1 mi/(h·s)
=4.4704×10−1m/s2mileperminutepersecond
mpm/s
≡1 mi/(min·s)
=26.8224 m/s2英里每二次方秒
mps2
≡1 mi/s2
=1.609344×103m/s2standardgravity
g
≡9.80665m/s2
=9.80665m/s2力編輯
力
Nameofunit
Symbol
Definition
RelationtoSIunits
atomicunitofforce
≡me·α2·c2/a0
≈8.23872206×10−8N[24]達因(cgsunit)
dyn
≡g·cm/s2
=10−5N
kilogram-force;kilopond;grave-force
kgf;kp;Gf
≡
g
×
1
{\displaystyleg\times1}
kg
=9.80665N
kip;kip-force
kip;kipf;klbf
≡
g
×
1000
{\displaystyleg\times1000}
lb
=4.4482216152605×103N
milligrave-force,gravet-force
mGf;gf
≡'g'×1g
=9.80665mN
牛頓(單位)(SI單位)
N
Aforcecapableofgivingamassofonekganaccelerationofonemetrepersecond,persecond.[25]
=1 N=1 kg·m/s2ounce-force
ozf
≡
g
×
1
{\displaystyleg\times1}
oz
=0.2780138509537812N
pound-force
lbf
≡
g
×
1
{\displaystyleg\times1}
lb
=4.4482216152605N
poundal
pdl
≡1 lb·ft/s2
=0.138254954376N
sthene(mtsunit)
sn
≡1t·m/s2
=1×103N
ton-force
tnf
≡
g
×
1
{\displaystyleg\times1}
shtn
=8.896443230521×103N
Seealso:Conversionbetweenweight(force)andmass
壓力或機械應力Pressureormechanicalstress編輯
Pressure
Nameofunit單位名稱
Symbol符號
Definition定義
RelationtoSIunits與SI單位的換算
標準大氣壓
atm
≡101325Pa[26]工程大氣壓
at
≡1kgf/cm2
=9.80665×104Pa[26]巴
bar
≡105Pa
毫巴
mbar
=10-3Bar
barye(cgsunit)
≡1dyn/cm2
=0.1Pa
厘米汞柱(4°C/39.2°F)
cmHg
≡13595.1 kg/m3×1 cm×g
≈1.33322×103Pa[26]厘米水柱(4°C/39.2°F)
cmH2O
≈999.972 kg/m3×1 cm×g
≈98.0638Pa[26]英尺汞柱(4°C/39.2°F)
ftHg
≡13595.1kg/m3×1 ft×g
≈40.63666×103Pa[26]英尺水柱(4°C/39.2°F)
ftH2O
≈999.972 kg/m3×1 ft×g
≈2.98898×103Pa[26]英寸汞柱(4°C/39.2°F)
inHg
≡13595.1kg/m3×1in×g
≈3.386389×103Pa[26]英寸水柱(4°C/39.2°F)
inH2O
≈999.972 kg/m3×1in×g
≈249.082Pa[26]公斤力每平方毫米
kgf/mm2
≡1kgf/mm2
=9.80665×106Pa[26]kippersquareinch
ksi
≡1kipf/sqin
≈6.894757×106Pa[26]微米汞柱(4°C/39.2°F)
μ
{\displaystyle\mu}
mHg
≡13595.1kg/m3×1
μ
{\displaystyle\mu}
m×g≈0.001torr
≈0.1333224Pa[26]毫米汞柱(4°C/39.2°F)
mmHg
≡13595.1kg/m3×1 mm×g≈1torr
≈133.3224Pa[26]毫米水柱(4°C/39.2°F)
mmH2O
≈999.972 kg/m3×1 mm×g=0.999972kgf/m2
=9.80638Pa
帕斯卡(SIunit)
Pa
≡N/m2=kg/(m·s2)
=1Pa[27]pièze(mtsunit)
pz
≡1000kg/m·s2
=1×103Pa=1kPa
磅力每平方英尺
psf
≡1 lbf/ft2
≈47.88026Pa[26]磅力每平方英寸
psi
≡1 lbf/in2
≈6.894757×103Pa[26]poundalpersquarefoot
pdl/sqft
≡1pdl/sqft
≈1.488164Pa[26]shorttonpersquarefoot
≡1shtn
×
g
1
{\displaystyle\times{\frac{g}{1}}}
sqft
≈95.760518×103Pa
托
torr
≡
101
325
760
{\displaystyle101{\frac{325}{760}}}
Pa
≈133.3224Pa[26]Torqueormomentofforce編輯
Torque
單位名稱
符號
定義
與SI單位的關係
foot-poundforce
ftlbf
≡
g
×
1
{\displaystyleg\times1}
lb×1 ft
=1.3558179483314004N·m
foot-poundal
ftpdl
≡1 lb·ft2/s2
=4.21401100938048×10−2N·m
inch-poundforce
inlbf
≡
g
×
1
{\displaystyleg\times1}
lb×1in
=0.1129848290276167N·m
米·千克
mkg
≡N×m/g
≈0.101971621N·m
牛·米(SI單位)
N·m
≡N×m=kg·m2/s2
=1N·m
能量編輯
能量
單位名稱
符號
定義
與SI單位的關係
barrelofoilequivalent
bboe
≈5.8×106BTU59°F
≈6.12×109J
Britishthermalunit(ISO)
BTUISO
≡1.0545×103J
=1.0545×103J
Britishthermalunit(InternationalTable)
BTUIT
=1.05505585262×103J
Britishthermalunit(mean)
BTUmean
≈1.05587×103J
Britishthermalunit(thermochemical)
BTUth
≈1.054350×103J
Britishthermalunit(39°F)
BTU39°F
≈1.05967×103J
Britishthermalunit(59°F)
BTU59°F
≡1.054804×103J
=1.054804×103J
Britishthermalunit(60°F)
BTU60°F
≈1.05468×103J
Britishthermalunit(63°F)
BTU63°F
≈1.0546×103J
calorie(InternationalTable)
calIT
≡4.1868J
=4.1868J
calorie(mean)
calmean
1⁄100oftheenergyrequiredtowarmonegramofair-freewaterfrom0 °Cto100 °C@1 atm
≈4.19002J
calorie(thermochemical)
calth
≡4.184J
=4.184J
卡路里(3.98°C)
cal3.98°C
≈4.2045J
卡路里(15°C)
cal15°C
≡4.1855J
=4.1855J
卡路里(20°C)
cal20°C
≈4.1819J
攝氏度heatunit(InternationalTable)
CHUIT
≡1BTUIT×1K/°R
=1.899100534716×103J
cubiccentimetreofatmosphere;standardcubiccentimetre
ccatm;scc
≡1atm×1 cm3
=0.101325J
cubicfootofatmosphere;standardcubicfoot
cuftatm;scf
≡1atm×1 ft3
=2.8692044809344×103J
cubicfootofnaturalgas
≡1000BTUIT
=1.05505585262×106J
cubicyardofatmosphere;standardcubicyard
cuydatm;scy
≡1atm×1yd3
=77.4685209852288×103J
electronvolt
eV
≡e×1V
≈1.60217733×10−19±4.9×10-26J
erg(cgsunit)
erg
≡1g·cm2/s2
=10−7J
foot-poundforce
ftlbf
≡g×1 lb×1 ft
=1.3558179483314004J
foot-poundal
ftpdl
≡1 lb·ft2/s2
=4.21401100938048×10−2J
gallon-atmosphere(英制)
impgalatm
≡1atm×1gal(imp)
=460.63256925J
gallon-atmosphere(美國)
USgalatm
≡1atm×1gal(美國)
=383.5568490138J
hartree,atomicunitofenergy
Eh
≡me·α2·c2(=2Ry)
≈4.359744×10−18J
horsepower-hour
hp·h
≡1 hp×1h
=2.684519537696172792×106J
inch-poundforce
inlbf
≡g×1 lb×1in
=0.1129848290276167J
joule(SIunit)
J
Theworkdonewhenaforceofonenewtonmovesthepointofitsapplicationadistanceofonemetreinthedirectionoftheforce.[25]
=1 J=1 m·N=1 kg·m2/s2=1 C·V=1 W·s
千卡、大卡
kcal;Cal
≡1000calIT
=4.1868×103J
kilowatt-hour;BoardofTradeUnit
kW·h;B.O.T.U.
≡1 kW×1h
=3.6×106J
litre-atmosphere
latm;sl
≡1atm×1L
=101.325J
quad
≡1015BTUIT
=1.05505585262×1018J
rydberg
Ry
≡R∞·ℎ·c
≈2.179872×10−18J
therm(E.C.)
≡100000BTUIT
=105.505585262×106J
therm(美國)
≡100000BTU59°F
=105.4804×106J
thermie
th
≡1McalIT
=4.1868×106J
tonofcoalequivalent
TCE
≡7Gcalth
=29.3076×109J
tonofoilequivalent
TOE
≡10Gcalth
=41.868×109J
tonofTNT
tTNT
≡1Gcalth
=4.184×109J
Powerorheatflowrate編輯
Power
單位名稱
符號
定義
與SI單位的關係
atmosphere-cubiccentimetreperminute
atmccm
≡1atm×1 cm3/min
=1.68875×10−3W
atmosphere-cubiccentimetrepersecond
atmccs
≡1atm×1 cm3/s
=0.101325W
atmosphere-cubicfootperhour
atmcfh
≡1atm×1cuft/h
=0.797001244704W
atmosphere-cubicfootperminute
atm·cfm
≡1atm×1cuft/min
=47.82007468224W
atmosphere-cubicfootpersecond
atmcfs
≡1atm×1cuft/s
=2.8692044809344×103W
BTU(InternationalTable)perhour
BTUIT/h
≡1BTUIT/h
≈0.293071W
BTU(InternationalTable)perminute
BTUIT/min
≡1BTUIT/min
≈17.584264W
BTU(InternationalTable)persecond
BTUIT/s
≡1BTUIT/s
=1.05505585262×103W
calorie(InternationalTable)persecond
calIT/s
≡1calIT/s
=4.1868W
ergpersecond
erg/s
≡1erg/s
=10−7W
foot-pound-forceperhour
ftlbf/h
≡1 ftlbf/h
≈3.766161×10−4W
foot-pound-forceperminute
ftlbf/min
≡1 ftlbf/min
=2.259696580552334×10−2W
foot-pound-forcepersecond
ftlbf/s
≡1 ftlbf/s
=1.3558179483314004W
horsepower(boiler)
bhp
≈34.5 lb/h×970.3BTUIT/lb
≈9.810657×103W
horsepower(Europeanelectrical)
hp
≡75kp·m/s
=736W
horsepower(imperialelectrical)
hp
≡746W
=746W
horsepower(imperialmechanical)
hp
≡550 ftlbf/s
=745.69987158227022W
horsepower(公制)
hp
≡75mkgf/s
=735.49875W
litre-atmosphereperminute
L·atm/min
≡1atm×1L/min
=1.68875W
litre-atmospherepersecond
L·atm/s
≡1atm×1L/s
=101.325W
lusec
lusec
≡1L·µmHg/s[14]
≈1.333×10−4W
poncelet
p
≡100mkgf/s
=980.665W
squarefootequivalentdirectradiation
sqftEDR
≡240BTUIT/h
≈70.337057W
tonofairconditioning
≡2000 lbsoficemelted/24h
≈3504W
tonofrefrigeration(英制)
≡2240 lb×iceIT/24h:iceIT=144°F×2326J/kg.°F
≈3.938875×103W
tonofrefrigeration(IT)
≡200 lbs×iceIT/24h:iceIT=144°×2326J/kg.°F
≈3.516853×103W
watt(SIunit)
W
Thepowerwhichinonesecondoftimegivesrisetoonejouleofenergy.[25]
=1 W=1 J/s=1 N·m/s=1 kg·m2/s3Action編輯
Action
Nameofunit
Symbol
Definition
RelationtoSIunits
atomicunitofaction
au
≡ℏ≡ℎ/2π
≈1.05457168×10−34J·s[28]Dynamic黏度編輯
Dynamic黏度
單位名稱
符號
定義
與SI單位的關係
pascalsecond(SIunit)
Pa·s
≡N·s/m2,kg/(m·s)
=1Pa·s
poise(cgsunit)
P
≡1barye·s
=0.1Pa·s
poundperfoothour
lb/(ft·h)
≡1 lb/(ft·h)
≈4.133789×10-4Pa·s
poundperfootsecond
lb/(ft·s)
≡1 lb/(ft·s)
≈7000148816400000000♠1.488164 Pa·s
pound-forcesecondpersquarefoot
lbf·s/ft2
≡1 lbf·s/ft2
≈7001478802600000000♠47.88026 Pa·s
pound-forcesecondpersquareinch
lbf·s/in2
≡1 lbf·s/in2
≈7003689475700000000♠6894.757 Pa·s
Kinematic黏度編輯
Kinematic黏度
單位名稱
符號
定義
與SI單位的關係
squarefootpersecond
ft2/s
≡1 ft2/s
=6998929030400000000♠0.09290304 m2/s
squaremetrepersecond(SIunit)
m2/s
≡1 m2/s
=1 m2/s
stokes(cgsunit)
St
≡10−4 m2/s
=10−4 m2/s
電流編輯
電流
單位名稱
符號
定義
與SI單位的關係
ampere(SIbaseunit)
A
≡Theconstantcurrentneededtoproduceaforceof2×10-7newtonpermetrebetweentwostraightparallelconductorsofinfinitelengthandnegligiblecircularcross-sectionplacedonemetreapartinavacuum.[8]
=1A
electromagneticunit;abampere(cgsunit)
abamp
≡10A
=10A
esupersecond;statampere(cgsunit)
esu/s
≡(0.1A·m/s)/c
≈6990333564100000000♠3.335641×10−10 A
Electriccharge編輯
Electriccharge
Nameofunit
Symbol
Definition
RelationtoSIunits
abcoulomb;electromagneticunit(cgsunit)
abC;emu
≡10C
=10C
atomicunitofcharge
au
≡e
≈1.602176462×10−19C
coulomb(SIunit)
C
≡Theamountofelectricitycarriedinonesecondoftimebyoneampereofcurrent.[25]
=1C=1A·s
faraday
F
≡1 mol×NA·e
≈96485.3383C
statcoulomb;franklin;electrostaticunit(cgsunit)
statC;Fr;esu
≡(0.1A·m)/c
≈3.335641×10−10C
Electricdipole編輯
Electricdipole
Nameofunit
Symbol
Definition
RelationtoSIunits
atomicunitofelectricdipolemoment
ea0
≈8.47835281×10-30C·m[29]coulombmeter
C·m
=1C·1m
debye
D
=10−10esu·Å
=3.33564095×10-30C·m[30]Electromotiveforce,electricpotentialdifference編輯
Voltage,electromotiveforce
Nameofunit
符號
Definition
RelationtoSIunits
abvolt(cgsunit)
abV
≡1×10-8V
=1×10-8V
statvolt(cgsunit)
statV
≡c·(1μJ/A·m)
=299.792458V
伏特(SIunit)
V
Thedifferenceinelectricpotentialacrosstwopointsalongaconductingwirecarryingoneampereofconstantcurrentwhenthepowerdissipatedbetweenthepointsequalsonewatt.[25]
=1V=1W/A=1kg·m2/(A·s3)
Electricalresistance編輯
Electricalresistance
Nameofunit
Symbol
Definition
RelationtoSIunits
ohm(SIunit)
Ω
Theresistancebetweentwopointsinaconductorwhenonevoltofelectricpotentialdifference,appliedtothesepoints,producesoneampereofcurrentintheconductor.[25]
=1Ω=1V/A=1kg·m2/(A2·s3)
電容Capacitance編輯
Capacitor'sabilitytostorecharge
Nameofunit
Symbol
Definition
RelationtoSIunits
farad(SIunit)
F
Thecapacitancebetweentwoparallelplatesthatresultsinonevoltofpotentialdifferencewhenchargedbyonecoulombofelectricity.[25]
=1F=1C/V=1A2·s4/(kg·m2)
Magneticflux編輯
magneticflux
Nameofunit
Symbol
Definition
RelationtoSIunits
maxwell(CGSunit)
Mx
≡10−8Wb[31]
=1×10-8Wb
weber(SIunit)
Wb
Magneticfluxwhich,linkingacircuitofoneturn,wouldproduceinitanelectromotiveforceof1voltifitwerereducedtozeroatauniformratein1second.[25]
=1Wb=1V·s=1kg·m2/(A·s2)
Magneticfluxdensity編輯
WhatphysicistscallMagneticfieldiscalledMagneticfluxdensitybyelectricalengineersandmagneticinductionbyappliedmathematiciansandelectricalengineers.
Nameofunit
Symbol
Definition
RelationtoSIunits
gauss(CGSunit)
G
≡Mx/cm2=10−4T
=1×10-4T[32]tesla(SIunit)
T
≡Wb/m2
=1T=1Wb/m2=1kg/(A·s2)
Inductance編輯
Inductance
Nameofunit
Symbol
Definition
RelationtoSIunits
henry(SIunit)
H
Theinductanceofaclosedcircuitthatproducesonevoltofelectromotiveforcewhenthecurrentinthecircuitvariesatauniformrateofoneamperepersecond.[25]
=1H=1Wb/A=1kg·m2/(A·s)2
溫度編輯
更多資訊:Conversionofunitsoftemperature
溫度
單位名稱
符號
定義
與SI單位的關係
攝氏溫標Celsius
°C
°C≡K
−
273.15
{\displaystyle-273.15}
[K]≡[°C]
+
273.15
{\displaystyle+273.15}
degreeDelisle
°De
[K]=373.15−[°De]
×
2
3
{\displaystyle\times{\frac{2}{3}}}
華氏溫標Fahrenheit
°F
°F≡°C
×
9
5
+
32
{\displaystyle\times{\frac{9}{5}}+32}
[K]≡([°F]+459.67)
×
9
5
{\displaystyle\times{\frac{9}{5}}}
牛頓溫標Newton
°N
[K]=[°N]
×
100
33
+
273.15
{\displaystyle\times{\frac{100}{33}}+273.15}
蘭金溫標Rankine
°R;
°R≡K
×
9
5
{\displaystyle\times{\frac{9}{5}}}
[K]≡[°R]
×
5
9
{\displaystyle\times{\frac{5}{9}}}
列氏溫標Réaumur
°Ré
[K]=[°Ré]
×
5
4
+
273.15
{\displaystyle\times{\frac{5}{4}}+273.15}
羅氏溫標Rømer
°Rø
[K]=([°Rø]−7.5)
×
40
21
+
273.15
{\displaystyle\times{\frac{40}{21}}+273.15}
ReguloGasMark
GM;
°F≡GM
×
25
+
300
{\displaystyle\times25+300}
[K]≡[GM]
×
125
9
+
422.038
{\displaystyle\times{\frac{125}{9}}+422.038}
開氏溫標Kelvin(國際標準單位)
K
≡1/273.16ofthethermodynamictemperatureofthetriplepointofwater.[8]
≡1K
Informationentropy編輯
Informationentropy
Nameofunit
Symbol
Definition
RelationtoSIunits
Relationtobits
SIunit
J/K
≡J/K
=1J/K
nat;nip;nepit
nat
≡kB
=1.3806505(23)×10-23J/K
bit;shannon
bit;b;Sh
≡ln(2)×kB
=9.569940(16)×10-24J/K
=1bit
ban;hartley
ban;Hart
≡ln(10)×kB
=3.1790653(53)×10-23J/K
nibble
≡4bits
=3.8279760(64)×10-23J/K
=22bit
byte
B
≡8bits
=7.655952(13)×10-23J/K
=23bit
千字節(十進位)
kB
≡1000B
=7.655952(13)×10-20J/K
=8×103bit=8000bit
kibibyte
KB;KiB
≡1024B
=7.839695(13)×10-20J/K
=213bit=8192bit
Often,informationentropyismeasuredinshannons,whereasthe(discrete)storagespaceofdigitaldevicesismeasuredinbits.Thus,uncompressedredundantdataoccupymorethanonebitofstoragepershannonofinformationentropy.Themultiplesofabitlistedaboveareusuallyusedwiththismeaning.Othertimesthebitisusedasameasureofinformationentropyandisthusasynonymofshannon.
Luminousintensity編輯
ThecandelaisthepreferrednomenclaturefortheSIunit.
Luminousintensity
Nameofunit
Symbol
Definition
RelationtoSIunits
candela(SIbaseunit);candle
cd
Theluminousintensity,inagivendirection,ofasourcethatemitsmonochromaticradiationoffrequency540×1012hertzandthathasaradiantintensityinthatdirectionof1/683wattpersteradian.[8]
=1 cd
candlepower(new)
cp
≡cdTheuseofcandlepowerasaunitisdiscouragedduetoitsambiguity.
=1 cd
candlepower(old,pre-1948)
cp
Variesandispoorlyreproducible.[33]Approximately0.981 cd.[14]
≈0.981 cd
Luminance編輯
Luminance
Nameofunit
Symbol
Definition
RelationtoSIunits
candelapersquarefoot
cd/ft2
≡cd/ft2
≈7001107639104170000♠10.763910417 cd/m2
candelapersquareinch
cd/in2
≡cd/in2
≈7003155000310000000♠1550.0031 cd/m2
candelapersquaremetre(SIunit);nit(deprecated[14])
cd/m2
≡cd/m2
=1 cd/m2footlambert
fL
≡(1/π)cd/ft2
≈7000342625909960000♠3.4262590996 cd/m2
lambert
L
≡(104/π)cd/m2
≈7003318309886180000♠3183.0988618 cd/m2
stilb(CGSunit)
sb
≡104cd/m2
≈1×104 cd/m2Luminousflux編輯
Luminousflux
Nameofunit
Symbol
Definition
RelationtoSIunits
lumen(SIunit)
lm
≡cd·sr
=1 lm=1 cd·sr
Illuminance編輯
Illuminance
Nameofunit
Symbol
Definition
RelationtoSIunits
footcandle;lumenpersquarefoot
fc
≡lm/ft2
=7001107639104170000♠10.763910417 lx
lumenpersquareinch
lm/in2
≡lm/in2
≈7003155000310000000♠1550.0031 lx
lux(SIunit)
lx
≡lm/m2
=1 lx=1 lm/m2phot(CGSunit)
ph
≡lm/cm2
=1×104lx
Radiation-sourceactivity編輯
Radioactivity
Nameofunit
Symbol
Definition
RelationtoSIunits
becquerel(SIunit)
Bq
≡Numberofdisintegrationspersecond
=1Bq=1/s
curie
Ci
≡3.7×1010Bq
=3.7×1010Bq[34]rutherford(H)
rd
≡1MBq
=1×106Bq
Pleasenotethatalthoughbecquerel(Bq)andhertz(Hz)bothultimatelyrefertothesameSIbaseunit(s−1),Hzisusedonlyforperiodicphenomena,andBqisonlyusedforstochasticprocessesassociatedwithradioactivity.[35]
Radiation-exposure編輯
Radiation-exposure
Nameofunit
Symbol
Definition
RelationtoSIunits
roentgen
R
1R≡2.58×10-4C/kg[31]
=2.58×10-4C/kg
TheroentgenisnotanSIunitandtheNISTstronglydiscouragesitscontinueduse.[36]
Radiation-absorbeddose編輯
Radiation-absorbeddose
Nameofunit
Symbol
Definition
RelationtoSIunits
gray(SIunit)
Gy
≡1J/kg=1m2/s2[37]
=1Gy
rad
rad
≡0.01Gy[31]
=0.01Gy
Radiation-equivalentdose編輯
Radiation-equivalentdose
Nameofunit
Symbol
Definition
RelationtoSIunits
Röntgenequivalentman
rem
≡0.01Sv
=0.01Sv
sievert(SIunit)
Sv
≡1J/kg[35]
=1Sv
Althoughthedefinitionsforsievert(Sv)andgray(Gy)wouldseemtoindicatethattheymeasurethesamequantities,thisisnotthecase.Theeffectofreceivingacertaindoseofradiation(givenasGy)isvariableanddependsonmanyfactors,thusanewunitwasneededtodenotethebiologicaleffectivenessofthatdoseonthebody;thisisknownastheequivalentdoseandisshowninSv.Thegeneralrelationshipbetweenabsorbeddoseandequivalentdosecanberepresentedas
H=Q·DwhereHistheequivalentdose,Distheabsorbeddose,andQisadimensionlessqualityfactor.Thus,foranyquantityofDmeasuredinGy,thenumericalvalueforHmeasuredinSvmaybedifferent.[38]
Softwaretools編輯
HomeandofficecomputerscomewithconvertersinbundledspreadsheetapplicationsorcanaccessfreeconvertersviatheInternet.Unitsandmeasurementscanbeeasilyconvertedusingthesetools,butonlyiftheunitsareexplicitlydefinedandtheconversioniscompatible(e.g.,cmHgtokPa).
Generalcommercialsourcesofconverters編輯
Advancedelectroniccalculatorshaveunit-conversionfunctionality.
Spreadsheetprogramsusuallyprovideconversionfunctionsorformulasortheusercanwritetheirown.
Commercialmathematical,scientificandtechnicalapplicationsoftenincludeconverters.Infiction編輯
Whenameasureisconvertedtoanotherunitinafictionworklikeanovelorfilm,thevalueoftenlosesmeaning(asinnumerology)orgetstoomanysignificantdigits("40miles"turnsinto"64km").Forthisreason,authorssometimeschoosenumbersthatcanbeconvertedeasily.Mostnotably,distancesmeasuredinmilesoftenbeginwith3or5,sothevalueghjcfugffyhfdfgjvcgconvertedtokmalsohasonesignificantdigit(5or8).
參見編輯
準確與精密
溫度單位換算
假精確
英制單位
國際單位制
米制
自然單位制
數值修約規則
有效數字
國際單位制詞頭
計量單位
參考資料編輯
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^3.03.1NationalInstituteofStandardsandTechnologyGeneralTablesofUnitsofMeasurement.[2012-10-20].(原始內容存檔於2011-12-10).
^4.004.014.024.034.044.054.064.074.084.094.104.114.124.13Lide,D.(Ed.).(1990).HandbookofChemistryandPhysics(71sted).BocaRaton,FL:CRCPress.Section1.
^5.05.1NationalBureauofStandards.(June30,1959).Refinementofvaluesfortheyardandthepound.FederalRegister,viewedSeptember20,2006atNationalGeodeticSurveywebsite(頁面存檔備份,存於網際網路檔案館).
^TheInternationalAstronomicalUnionandAstronomicalUnits.[2012-10-20].(原始內容存檔於2009-10-22).
^Klein,HerbertArthur.(1988).TheScienceofMeasurement:aHistoricalSurvey.Mineola,NY:DoverPublications0-4862-5839-4.
^8.08.18.28.38.48.5TheInternationalSystemofUnits,Section2.18,BureauInternationaldesPoidsetMesures,2006[August26,2009],(原始內容存檔於2009年10月1日)
^InternationalSystemofUnits,(頁面存檔備份,存於網際網路檔案館)8thed.(2006),BureauInternationaldesPoidsetMesures,Section4.1Table8.
^P.KennethSeidelmann,Ed.(1992).ExplanatorySupplementtotheAstronomicalAlmanac.Sausalito,CA:UniversityScienceBooks.p.716ands.v.parsecinGlossary.
^11.011.111.2Whitelaw,Ian.(2007).AMeasureofAllThings:TheStoryofManandMeasurement.NewYork:Macmillan0-312-37026-1.p.152.
^12.012.1DeVinne,TheodoreLow(1900).Thepracticeoftypography:atreatiseontheprocessesoftype-making,thepointsystem,thenames,sizes,stylesandpricesofplainprintingtypes2nded.NewYork:TheCenturyCo.p.142–150.
^Pasko,WesleyWashington(1894).Americandictionaryofprintingandbookmaking.(1894).NewYork:HowardLockwood.p.521.
^14.014.114.214.314.414.5Rowlett,Russ,HowMany?ADictionaryofUnitsofMeasurement,2005[2012-10-20],(原始內容存檔於2018-10-06)
^Thompson,A.andTaylor,B.N.(2008).GuidefortheUseoftheInternationalSystemofUnits(SI).NationalInstituteofStandardsandTechnologySpecialPublication811.p.57.
^16.016.116.216.316.4USCodeofFederalRegulations,Title21,Section101.9,Paragraph(b)(5)(viii),[August29,2009],(原始內容存檔於2009年8月13日)
^BarryN.Taylor,Ed.,NISTSpecialPublication330:TheInternationalSystemofUnits(SI)(頁面存檔備份,存於網際網路檔案館)(2001Edition),Washington:USGovernmentPrintingOffice,43,"The12thConferenceGeneraledesPoidsetMesures(CGPM)…declaresthattheword「litre」maybeemployedasaspecialnameforthecubicdecimetre".
^CODATAValue:atomicuintofmass.(頁面存檔備份,存於網際網路檔案館)(2006).NationalInstituteofStandardsandTechnology.Retrieved16September2008.
^TheSwissFederalOfficeforMetrologygivesZentneronaGermanlanguagewebpage存档副本.[2006-10-09].(原始內容存檔於2006-09-28). andquintalontheEnglishtranslationofthatpage存档副本.[2006-10-09].(原始內容存檔於2001-03-09). ;theunitismarked"spécifiquementsuisse !"
^20.020.1PedersenO.(1983)."Glossary"inCoyne,G.,Hoskin,M.,andPedersen,O.GregorianReformoftheCalendar:ProceedingsoftheVaticanConferencetoCommemorateits400thAnniversary.VaticanObservatory.AvailablefromAstrophysicsDataSystem.
^Richards,E.G.,MappingTime,OxfordUniversityPress:94–95,1998,ISBN 0-19-850413-6
^Steel,Duncan,MarkingTime,JohnWiley&Sons:46,2000,ISBN 0-471-29827-1
^TomBenson.(2010.)"MachNumber"(頁面存檔備份,存於網際網路檔案館)inBeginner'sGuidetoAeronautics.NASA.
^CODATAValue:atomicunitofforce(頁面存檔備份,存於網際網路檔案館).(2006).NationalInstituteofStandardsandTechnology.RetrievedSeptember14,2008.
^25.025.125.225.325.425.525.625.725.8ComitéInternationaldesPoidsetMesures,Resolution2,1946[August26,2009],(原始內容存檔於2008-07-25)
^26.0026.0126.0226.0326.0426.0526.0626.0726.0826.0926.1026.1126.1226.1326.1426.15BarryN.Taylor,(April1995),GuidefortheUseoftheInternationalSystemofUnits(SI)(頁面存檔備份,存於網際網路檔案館)(NISTSpecialPublication811),Washington,DC:USGovernmentPrintingOffice,pp.57–68.
^BarryN.Taylor,(April1995),GuidefortheUseoftheInternationalSystemofUnits(SI)(NISTSpecialPublication811),Washington,DC:USGovernmentPrintingOffice,p.5.
^InternationalSystemofUnits,(頁面存檔備份,存於網際網路檔案館)8thed.(2006),BureauInternationaldesPoidsetMesures,Section4.1Table7.
^TheNISTReferenceonConstants,Units,andUncertainty,2006[August26,2009],(原始內容存檔於2016-04-07)
^RobertG.MortimerPhysicalchemistry,AcademicPress,2000ISBN0-12-508345-9,page677
^31.031.131.2NISTGuidetoSIUnits,AppendixB.9,[August27,2009],(原始內容存檔於2016-01-27)
^StandardfortheUseoftheInternationalSystemofUnits(SI):TheModernMetricSystemIEEE/ASTMSI10-1997.(1997).NewYorkandWestConshohocken,PA:InstituteofElectricalandElectronicsEngineersandAmericanSocietyforTestingandMaterials.TablesA.1throughA.5.
^TheNISTReferenceonConstants,Units,andUncertainty,[August28,2009],(原始內容存檔於2013-12-16)
^AmblerThompson&BarryN.Taylor.(2008).GuidefortheUseoftheInternationalSystemofUnits(SI).(頁面存檔備份,存於網際網路檔案館)SpecialPublication811.Gaithersburg,MD:NationalInstituteofStandardsandTechnology.p.10.
^35.035.1TheInternationalSystemofUnits,Section2.2.2.,Table38,BureauInternationaldesPoidsetMesures,2006[August27,2009],(原始內容存檔於2007年6月18日)
^TheNISTGuidetotheSI(SpecialPublication811),section5.2,2008[August27,2009],(原始內容存檔於2008-06-12)
^AmblerThompson&BarryN.Taylor.(2008).GuidefortheUseoftheInternationalSystemofUnits(SI).(頁面存檔備份,存於網際網路檔案館)SpecialPublication811.Gaithersburg,MD:NationalInstituteofStandardsandTechnology.p.5.
^Comitéinternationaldespoidsetmesures,2002,Recommendation2,[August27,2009],(原始內容存檔於2016-06-19)
Notes
外部連結編輯
維基教科書中的相關電子教學:FHSSTPhysicsUnits:HowtoChangeUnitsStatutoryInstrument1995No.1804Unitsofmeasurementregulations1995Fromlegislation.gov.uk(頁面存檔備份,存於網際網路檔案館)
HowMany?Adictionaryofunitsofmeasurement(頁面存檔備份,存於網際網路檔案館)
NIST:Fundamentalphysicalconstants—Non-SIunitsPDF (35.7 KB)
NISTGuidetoSIUnits(頁面存檔備份,存於網際網路檔案館)Manyconversionfactorslisted.
TheUnifiedCodeforUnitsofMeasure
Units,Symbols,andConversionsXMLDictionary(頁面存檔備份,存於網際網路檔案館)
Unitconverteronline(英文)
開放式目錄計劃中和UnitsofMeasurementSoftware相關的內容
開放式目錄計劃中和UnitsofMeasurementOnlineConversion相關的內容
取自「https://zh.wikipedia.org/w/index.php?title=单位换算&oldid=72854091」
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