Nom |
Nom anglais(1) |
Symbole |
Équivalence |
mètre |
metre ou meter |
m |
(Unité de base du SI) |
centimètre |
|
cm |
(Unité de base du système CGS) ≡ 10-2m |
fermi |
|
|
≡ 10-15m |
siegbahn |
X-unit |
xu |
≈ 1,0000021×10-13m |
stigma |
stigma |
|
≡ 10-12m = 1 pm |
ångström |
|
Å |
≡ 10-10m = 0,1 nm |
micromètre, Micron |
|
μ |
≡ 10-6m = 1 μm |
|
twip |
twp |
≡ 1/1440 in ≈ 17,639 μm |
|
mil; thou |
mil |
≡ 0,001 in = 25,4 μm |
|
mickey |
|
≡ 1/200 in = 0,127 mm |
|
calibre |
cal |
≡ 1/100 in = 0,254 mm |
ligne |
line |
ln |
≡ 1/12 in ≈ 2,116 667 mm |
ligne (Paris) |
|
l |
≡ 1/12 p ≈ 2,255 829 mm |
grain d'orge |
barleycorn |
|
≡ 1/3 in ≈ 8,466 667 mm |
doigt |
finger |
|
≡ 7/8 in = 22,225 mm |
pouce |
inch |
in |
≡ 2,54 cm |
pouce (Paris) |
|
p |
≡ 1/12 P ≈ 27,069 949 mm |
|
stick |
|
≡ 2 in = 50,8 mm |
clou |
nail |
|
≡ 2 1/4 in = 57,15 mm |
paume |
palm |
|
≡ 3 in = 76,2 mm |
main |
hand |
|
≡ 4 in = 101,6 mm |
doigt (tissu) |
finger (cloth) |
|
≡ 4 1/2 in = 114,3 mm |
empan |
span |
|
≡ 6 in = 152,4 mm |
chaînon de Gunter |
link (Gunter's) |
lnk |
≡ 66/100 ft = 0,201 168 m |
quart |
span (cloth); quarter |
|
≡ 1/4 yd = 9 in
= 0,2286 m |
pied |
foot |
ft |
≡ 12 in = 0,3048 m |
pied (Paris); pied de roi |
|
P |
≈ 0,324 839 385 m |
pied (québécois) |
|
P |
≡ 0,324 840 6 m |
coudée |
cubit |
|
≡ 18 in = 0,4572 m |
pas |
pace |
|
≡ 2 1/2 ft = 0,762 m |
verge |
yard |
yd |
≡ 3 ft = 0,9144 m |
aune |
ell |
|
≡ 45 in = 1,143 m |
aune (Paris) |
|
|
≡ 3 P 7 p 10 l ≈ 1,186 566 m |
pas double |
double pace; milli-mile |
|
≡ 1/1000 mi = 1,609 344 m |
brasse; toise marine |
fathom |
fm |
≡ 6 ft = 1,8288 m
(parfois ≡ 1/1000 NM = 1,852 m) |
toise (Paris) |
|
T |
≡ 6 P = 864/443,296 m ≈ 1,949 036 310 m |
toise (québécoise) |
|
T |
≡ 1,949 043 6 m |
perche |
rod; pole; perch |
rd |
≡ 16 1/2 ft = 5,0292 m |
perche (Paris) |
|
per |
≡ 18 P = 2592/443,296 m≈ 5,847 108 929 m |
perche (québécoise) |
|
per |
≡ 5,847 130 8 m |
corde |
rope |
|
≡ 20 ft = 6,096 m |
perche ordinaire |
|
per |
≡ 20 P = 2880/443,296 m ≈ 6,496 787 70 m |
chaîne de Gunter |
chain (Gunter's) |
ch |
≡ 66 ft = 20,1168 m |
chaîne de Ramden |
chain (Ramden's; Engineer's) |
ch |
≡ 100 ft = 30,48 m |
arpent |
|
arp |
≡ 180 P = 25 920/443,296 m ≈ 58,471 089 295 m |
arpent (québécois) |
|
arp |
≡ 58,471 308 m |
encablure |
cable length |
|
≡ 1/10 NM = 185,2 m |
encablure (Royal Navy) |
cable length (imperial) |
|
≡ 608 ft = 185,3184 m |
furlong |
furlong |
fur |
≡ 660 ft = 201,168 m |
encablure (US Navy) |
cable length (U.S.) |
|
≡ 720 ft = 219,456 m |
mille (terrestre) |
mile |
mi |
≡ 1760 yd = 5280 ft = 1609,344 m |
mille américain |
U.S. Survey mile; statute mile |
mi |
≡ 5280 ft US (1 ft US ≡ 1200/3937 m) ≈ 1,609 347 219 km |
mille marin international |
nautical mile (international) |
NM |
≡ 1852 m |
mille marin (anglais) |
nautical mile (Admiralty) |
NM |
≡ 6080 ft = 1853,184 m |
mille géographique |
geographical mile |
mi |
≡ 6082 ft = 1853,7936 m |
mille télégraphique |
telegraph mile |
mi |
≡ 6087 ft = 1855,3176 m |
lieue postale |
|
|
≡ 2000 T ≈ 3,898 072 620 km |
lieue terrestre |
|
|
≡ 2280 T ≈ 4,443 802 786 km |
lieue |
league |
|
≡ 3 mi = 4,828 032 km |
lieue américaine |
statute league |
|
≡ 3 mi (US) ≈ 4,828 041 656 km |
lieue nautique; lieue marine |
nautical league |
NL |
≡ 3 NM = 5,556 km |
unité astronomique |
astronomical unit |
ua |
= 149 597 870,691 ± 0,030 km |
année-lumière |
light-year |
|
≡ c0×86 400×365,25 = 9,460 730 472 580 8×1015 m |
parsec |
|
pc |
≈ 180×60×60/π ua ≈ 206 264,806 25 ua = 3,261 563 776 9 ± 6×10-10 années-lumière = 3,085 677 581 3×1016 ± 6×106 m |
Lud |
|
Ld |
≈ 5 pied 4' |
Nom |
Nom anglais(1) |
Symbole |
Équivalence |
mètre carré |
square metre |
m2 |
≡ 1 m2 |
barn |
barn |
b |
≡ 10-28 m2 = 100 fm2 |
|
circular mil; circular thou |
circ mil |
≡ πD2/4 (lorsque D = 1 mil) ≈ 5,067 074 791×10-10 m2 |
|
square mil; square thou |
sq mil |
≡ 1 mil2 = 6,4516×10-10 m2 |
|
inch inch |
circ in |
≡ πD2/4 (lorsque D = 1 in) ≈ 5,067 074 791×10-4 m2 |
pouce carré |
square inch |
sq in |
≡ 1 in2 = 6,4516×10-4 m2 |
planche |
board |
bd |
≡ 1 in × 1 ft = 7,741 92×10-3 m2 |
pied carré |
square foot |
sq ft |
≡ 1 ft2 = 0,092 903 04 m2 |
verge carrée |
square yard |
sq yd |
≡ 1 yd2 = 0,836 127 36 m2 |
corde (de bois) |
cord |
|
≡ 192 planches = 1,486 448 64 m2 |
|
boiler horsepower EDR (equivalent direct radiation) |
|
≡ 1 sq ft × 1 bhp / 240 BTU/h
≈ 12,958 m2 |
perche carrée |
square rod; square pole; square perch |
sq rd |
≡ 1 rd2 = 25,292 852 64 m2 |
are |
|
a |
≡ 100 m2 |
chaîne carrée |
square chain |
sq ch |
≡ 1 ch2 = 404,685 642 24 m2 |
vergée |
rood |
ro |
≡ 1/4 ac = 1011,714 105 6 m2 |
acre |
acre |
ac |
≡ 10 sq ch = 4840 sq yd = 4046,856 422 4 m2 |
hectare |
|
ha |
≡ 10 000 m2 = 0,01 km2 |
préau |
virgate ou yardland |
|
≡ 30 ac = 0,121 405 692 672 km2 |
|
hide |
|
≡ 100 ac = 0,404 685 642 24 km2 |
mille carré |
square mile; section |
sq mi |
≡ 1 mi2 = 640 ac = 2,589 988 110 336 km2 |
baronnie |
barony |
|
≡ 4000 ac = 16,187 425 689 6 km2 |
commune |
township |
|
≡ 36 sq mi = 93,239 571 972 096 km2 |
canton |
township |
|
≡ 100 sq mi = 342,9904 km2 |
Nom |
Nom anglais(1) |
Symbole |
Équivalence |
Pied planche |
Board foot |
?? |
≡ 0.002360 m³ ou stères = 2.360 litres |
Corde (unité) |
Cord |
?? |
≡ 128 pieds cubes ou (~3.62 m³) |
mètre cube |
cubic metre |
m3 |
≡ 1000 L |
litre |
litre |
L |
≡ 1 dm3 |
|
lambda |
λ |
≡ 1 mm3 = 1 μl |
dram (impérial) |
dram (Imperial fluid); Imperial fluidram |
fl dr |
≡ 1/8 fl oz = 3,551 632 812 5 ml |
dram (américain) |
dram (U.S. fluid); U.S. fluidram |
fl dr |
≡ 1/8 US fl oz = 3,696 691 195 312 5 ml |
cuillerée à thé (canadienne) |
teaspoon (Canadian) |
tsp |
≡ 1/6 fl oz ≈ 4,735 510 416 667 ml |
cuillerée à thé (américaine) |
teaspoon (U.S.) |
tsp |
≡ 1/6 US fl oz = 4,928 921 593 75 ml |
cuillerée à thé (métrique) |
teaspoon (metric) |
|
≡ 5 ml |
petite cuillerée romaine (ligula) |
|
|
≡ 1/48 setier ≈ 11,25 ml |
cuillerée à table (canadienne) |
tablespoon (Canadian) |
tbsp |
≡ 1/2 fl oz = 14,206 531 25 ml |
cuillerée à table (américaine) |
tablespoon (U.S.) |
tbsp |
≡ 1/2 US fl oz = 14,786 764 781 25 ml |
cuillerée à table (métrique) |
tablespoon (metric) |
|
≡ 15 ml |
pouce cube |
cubic inch |
cu in |
≡ 1 in3 = 16,387 064 ml |
cuillerée à table (impériale) |
tablespoon (Imperial) |
tbsp |
≡ 5/8 fl oz = 17,758 164 062 5 ml |
once liquide (impériale) |
fluid ounce (Imperial) |
fl oz (Imp) |
≡ 1/160 gal (Imp) = 28,413 062 5 ml |
once liquide (américaine) |
ounce (U.S. fluid) |
fl oz (US) |
≡ 1/128 gal (US) = 29,573 529 562 5 ml |
cuillerée moyenne romaine (cyathus) |
ciate (Roman) |
|
≡ 1/12 setier ≈ 45 ml |
grande cuillerée romaine (acetabulum) |
acetabul (Roman) |
|
≡ 1/8 setier ≈ 67,5 ml |
roquille (américaine) |
gill (U.S.) |
gi |
≡ 4 fl oz (US) = 118,294 118 25 ml |
quart romain |
quart (Roman) |
|
≡ 1/4 setier ≈ 135 ml |
roquille (impériale) |
gill (Imperial); noggin |
gi; nog |
≡ 5 fl oz = 142,065 312 5 ml |
tasse (canadienne) |
cup (Canadian) |
c |
≡ 8 fl oz = 227,3045 ml |
tasse (américaine) |
cup (U.S.) |
c |
≡ 8 fl oz (US) = 1/2 chopine américaine = 236,588 236 5 ml |
tasse (métrique) |
cup (metric) |
c |
≡ 250 ml |
hémine romaine |
gemin (Roman) |
|
≡ 1/2 setier ≈ 270 ml |
demiard |
cup (Imperial) |
c |
≡ 10 fl oz = 1/2 pt (Imp) = 1/4 qt (Imp) = 284,130 625 ml |
chopine américaine |
pint (U.S. fluid) |
pt (US fl) |
≡ 16 fl oz (US) = 473,176 473 ml |
setier romain |
sextary (Roman) |
|
≡ 1/6 conge ≈ 540 ml |
chopine américaine |
pint (U.S. dry) |
pt (US dry) |
≡ 1/64 bu (US lvl) = 550,610 471 357 5 ml |
chopine impériale |
pint (Imperial) |
pt (Imp) |
≡ 20 fl oz (Imp) = 568,261 25 ml |
pinte américaine |
quart (U.S. fluid) |
qt (US fl) |
≡ 1/4 gal (US) = 0,946 352 946 l |
pinte américaine |
quart (U.S. dry) |
qt (US dry) |
≡ 1/32 bu (US lvl) = 1/4 gal (US dry) = 1,101 220 942 715 l |
pinte impériale |
quart (Imperial) |
qt (Imp) |
≡ 40 fl oz (Imp) = 1,136 522 5 l |
conge romain |
kognee (Roman) |
|
≈ 3,24 l (fluide) |
gallon américain |
gallon (U.S. fluid) |
gal (US) |
≡ 231 cu in = 3,785 411 784 l |
gallon américain |
gallon (U.S. dry) |
gal (US dry) |
≡ 1/8 bu (US lvl) = 4,404 883 770 86 l |
gallon impérial |
gallon (Imperial) |
gal (Imp) |
≡ 4,546 09 l |
muid romain |
|
|
≡ 16 conges ≈ 8,64 l (sec) |
urne romaine |
urn (Roman) |
|
≡ 4 conges ≈ 12,96 l (fluide) |
boisseau romain |
bushel (Roman) |
|
≡ 3 muids ≈ 25,92 l (sec) |
amphore romaine |
amphora (Roman) |
|
≡ 2 urnes ≈ 25,92 l (fluide) |
pied cube |
cubic foot |
cu ft |
≡ 1728 cu in = 28,316 846 592 l |
boisseau américain |
bushel (U.S. dry level) |
bu (US lvl) |
≡ 2150,42 cu in = 35,239 070 166 88 l |
boisseau impérial |
bushel (Imperial) |
bu (Imp) |
= 36,368 72 l |
boisseau américain |
bushel (U.S. dry heaped) |
bu (US heap) |
≡ 1 1/4 bu (US lvl) = 44,048 837 708 6 l |
baril de pétrole |
barrel (U.S. oil) |
bl |
≡ 42 gal (US) = 158,987 294 928 l |
baril |
barrel (Imperial) |
bl (Imp) |
≡ 36 gal (Imp) = 163,659 24 l |
outre romaine |
kulee; dolee (Roman) |
|
≡ 20 amphores ≈ 518,4 l (fluide) |
verge cube |
cubic yard |
cu yd |
≡ 27 cu ft = 0,764 554 857 984 m3 |
tonneau de mer |
freight ton |
|
≡ 40 cu ft = 1,132 673 863 68 m3 |
tonneau de douane |
load |
|
≡ 50 cu ft = 1,415 842 329 6 m3 |
tonneau de jauge |
register ton |
|
≡ 100 cu ft = 2,831 684 659 2 m3 |
stère (de bois) |
|
st |
≡ du bois fendu empilé dans un volume de 1 m3 |
Nom |
Nom anglais(1) |
Symbole |
Équivalence |
joule |
joule |
J |
≡ 1 kg·m2/s2 = 1 W·s |
|
rydberg |
Ry |
≡ R∞ × h × c ≈ 2,179 872×10-18 J |
|
hartree |
Eh |
≡ 2 Ry ≈ 4,359 744×10-18 J |
erg (CGS) |
erg |
erg |
≡ 1 g cm2/s2 = 10-7 J |
électron-volt |
electronvolt |
eV |
≡ 1,602 176 53×10-19 J |
calorie thermochimique |
thermochemical calorie |
calth |
≡ 4,184 J |
calorie 15°C |
calorie (15°C) |
cal15 |
≡ 4,1855 J |
calorie I.T. |
calorie (international) |
calIT |
≡ 4,1868 J |
British thermal unit (thermochimique) |
British thermal unit |
BTUth |
≡ 1 lb av calth °F / g °C = 9489,152 380 4 ÷ 9 J ≈ 1054,350 J |
British thermal unit (ISO) |
British thermal unit (ISO) |
BTUISO |
≡ 1054,5 J |
British thermal unit (63°F) |
British thermal unit (63°F) |
BTU63°F |
≈ 1054,6 J |
British thermal unit (60°F) |
British thermal unit (60°F) |
BTU60°F |
≈ 1054,68 J |
British thermal unit (59°F) |
British thermal unit (59°F) |
BTU59°F |
≡ 1054,804 J |
British thermal unit (International Table) |
British thermal unit (IT) |
BTUIT |
≡ 1 lb av calIT °F / g °C = 1055,055 852 62 J |
British thermal unit (moyen) |
British thermal unit (mean) |
BTUmoyen |
≈ 1055,87 J |
British thermal unit (39°F) |
British thermal unit (39°F) |
BTU39°F |
≈ 1059,67 J |
frigorie (15°C) |
|
fg |
≡ -1 kcal15°C = -4185,5 J |
kilowatt-heure |
Board of Trade Unit |
kWh ou B.O.T.U. |
≡ 1 kW × 1 h = 3 600 000 J |
thermie |
|
th |
≡ 106 calIT = 4 186 800 J |
therm américain |
therm (U.S.) |
|
≡ 100 000 BTU (59°F) = 1,054 804×108 J |
therm européen |
therm (E.C.) |
|
≡ 100 000 BTU (IT) = 1,055 055 852 62×108 J |
tonne de TNT |
tonne of TNT |
|
≡ 1000 th = 4,1868×109 J = 0,1 tep |
tonne équivalent charbon |
tonne of coal equivalent |
tec |
≡ 7000 th = 2,930 76×1010 J = 0,7 tep |
tonne équivalent pétrole |
tonne of oil equivalent |
tep |
≡ 10 000 th = 4,1868×1010 J |