Conversion of units.
Article courtesy of http://RacingSecrets.com
| Name of unit |
Symbol |
Relation to SI units |
|
Length, l
|
| metre (SI base unit) |
m |
|
| micron |
μ |
= μm = 10-6 m |
| ångström |
Å |
= 10-10 m |
| bohr? (au) |
a0, b |
~ 5.291 77 × 10-11 m |
| x unit |
X |
~ 1.002 × 10-13 m |
| Fermi |
|
=1×10-15 m |
| inch |
in |
= 2.54 × 10-2 m |
| foot |
ft |
= 12 in = 0.3048 m |
| yard |
yd |
= 3 ft = 0.9144 m |
| mile |
mi |
= 1760 yd = 1609.344 m |
| nautical mile |
|
= 1852 m = 6076.1 feet |
| geographical mile |
|
= 1855 m = 6087.15 feet |
| astronomical unit |
AU |
= 1.496 00 × 1011 m |
| parsec |
pc |
~ 3.085 68 × 1016 m |
| light year |
l.y. |
~ 9.460 528 × 1015 m |
| [light second]? |
|
299 792 458 m |
| mil |
|
=1×10-3 in = 2.54 ×10-5
m |
| Rod |
|
=5.02921005842 m |
| Chain |
|
=20.1168402337 m |
| Fathom |
|
=1.82880365761 m |
|
Area, A
|
| square metre (SI unit) |
m2 |
|
| barn? |
b |
10-28 m2 |
| acre |
|
~ 4046.856 m2 |
| are |
a |
= 100 m2 |
| hectare |
ha |
= 104 m2 |
|
Volume, V
|
| cubic metre (SI unit) |
m3 |
|
| litre |
l, L |
= dm3 = 10-3 m3 |
| lambda |
λ |
= μl = 10-6 dm3 |
| barrel (US) |
|
~ 158.987 dm3 |
| gallon (US) |
gal (US) |
= 3.78541 dm3 |
| gallon (UK) |
gal (UK) |
= 4.546 09 dm3 |
|
Mass, m
|
| kilogram (SI base unit) |
kg |
|
| electron mass (au) |
me |
~ 9.109 39 × 10-31 kg |
| unified atomic mass unit, dalton |
u, Da |
~ 1.660 540 × 10-27 kg |
| gamma |
γ |
= μg |
| tonne |
t |
= 103 kg |
| pound (avoirdupois) |
lb |
= 0.453 592 37 kg |
| ounce (avoirdupois) |
oz |
~ 28.3495 g |
| ounce (troy) |
oz (troy) |
~ 31.1035g |
| grain |
gr |
= 64.798 91 mg |
|
Time, t
|
| second (SI base unit) |
s |
|
| au of time |
|
~ 2.418 88 × 10-17 s |
| minute |
min |
= 60 s |
| hour |
h |
= 3600 s |
| day |
d |
= 86 400 s (not exactly defined due to leap seconds |
| year |
a |
~ 31 556 952 s |
| svedberg |
Sv |
= ~ 10-13 s |
|
Acceleration, a
|
| (SI unit) |
m·s-2 |
|
| standard acceleration of free fall |
gn |
= 9.806 65 m·s-2 |
| galileo |
Gal |
= 10-2 m·s-2 |
|
Force, F
|
| newton (SI unit) |
N |
= kg·m·s-2 |
| dyne (cgs unit) |
dyn |
= 10-5N |
| au of force |
|
~ 8.238 73 × 10-8N |
| pound-force |
lbf |
= 4.448 22 N |
| kilogram-force |
kgf |
= 9.806 65 N |
|
Pressure, p
|
| pascal (SI unit) |
Pa |
= N·m-2 = kg·m-1·s-2 |
| atmosphere |
atm |
= 101 325 Pa |
| bar |
bar |
= 105 Pa |
| torr |
Torr |
= (101 325/760) Pa ~ 133.322 Pa |
| millimetre of mercury (conventional) |
mmHg |
= 13.5951 × 980.655 × 10-2 Pa ~ 133.322
Pa |
| pounds per square inch |
psi |
~ 6.894 757 × 103 Pa |
|
Electric current, I
|
| ampere (SI base unit) |
A |
|
| esu per second (cgs unit) |
esu.s-1 |
~ ?? A |
| electromagnetic unit (cgs unit) |
abamp |
~ ?? A |
|
Electric charge, Q
|
| Coulomb (SI unit) |
C |
= A.s |
| statcoulomb, electrostatic unit (cgs unit) |
statC, esu |
~ 3.3356 × 10-10 C |
|
Voltage, Electromotive force, U
|
| Volt (SI unit) |
V |
= N·m·C-1 |
| statvolt? (cgs unit) |
statV |
=?? V |
|
Electric resistance, R
|
| ohm (SI unit) |
ohm |
= V·A-1 |
|
Energy, U
|
| joule (SI unit) |
J = N·m |
= kg·m2·s-2 |
| erg (cgs unit) |
erg |
= 10-7 J |
| hartee (au) |
Eh |
~4.359 75 × 10-18 J |
| rydberg |
Ry |
~ 2.179 87 × 10-18 J |
| electronvolt |
eV |
= e × V ~ 1.602 18 × 10-19 J |
| calorie, thermochemical |
calth |
= 4.184 J |
| calorie, international |
calIT |
= 4.1868 J |
| 15 °C calorie |
calIT |
~ 4.1855 J |
| litre atmosphere |
l atm |
= 101.325 J |
| British thermal unit |
Btu |
= 1055.06 J |
|
Power, P
|
| watt (SI unit) |
W |
= J·s-1 = N·m·s-1 =
kg·m2·s-3 |
| horse power |
hp |
=745.7 W |
|
Action, Angular momentum, L, J
|
| SI unit |
J·s = N·m·s |
= kg·m2·s-1 |
| cgs unit |
erg·s |
= 10-7 J·s |
| au of action |
h |
= h/2π = 1.054 57 × 10-34
J·s |
|
Dynamic viscosity, η
|
| SI unit |
Pa·s = N·m-2·s |
= kg·m-1·s-1 |
| poise |
P |
= 10-1Pa·s |
| centipoise |
cP |
= mPa·s |
|
Kinematic viscosity, ν
|
| SI unit |
m2·s-1 |
|
| stokes |
St |
= 10-4m2·s-1 |
|
Temperature, T
|
| kelvin (SI base unit) |
K |
|
| degree Celsius |
°C |
T in °C = T in K - 273.15 |
| degree Fahrenheit |
°F |
T in °F = 1.8 (T in °C) + 32 |
| degree Rankine |
°R |
= (5/9) K |
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This article courtesy of http://RacingSecrets.com , your racing technology resource.
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