تبديل واحدهاي مهم (به ويژه براي رشته الكترونيك)
|
Standard
Units
|
| Unit |
Symbol |
Definition |
Comments |
|
Time |
| second |
sec |
1 s |
|
| minute |
min |
60 s |
|
| hour |
hr |
60 min |
|
| hour |
hour |
1 hr |
alternate symbol |
| hour |
h |
1 hr |
alternate symbol |
| day |
day |
24 hr |
|
| shake |
shake |
10 ns |
|
| Hertz |
Hz |
1 s^-1 |
|
| Length or
Distance |
| international foot |
ft |
0.3048 m |
|
| inch |
in |
1.0/12.0 ft |
|
| international mile |
mile |
5280.0 ft |
|
| international mile |
mi |
1 mile |
alternate symbol |
| milli-inch |
mil |
0.001 in |
|
| Parsec |
pc |
3.085678e16 m |
|
| League |
league |
3 mile |
|
| Astronomical Unit |
ua |
1.49598e11 m |
|
| Astronomical Unit |
AU |
1.49598e11 m |
alternate symbol |
| yard |
yd |
3 ft |
|
| Angstrom |
Ang |
1e-10 m |
|
| Angstrom |
\\AA |
1 Ang |
alternate symbol |
| furlong |
furlong |
220 yd |
|
| fathom |
fathom |
6 ft |
|
| Rod |
rd |
16.5 ft |
|
| U.S. survey foot |
sft |
(1200./3937.) m |
|
| U.S. survey mile |
smi |
5280 sft |
also called statue mile |
| point |
pt |
1./72. in |
Typeface Point |
| pica |
pica |
1./6. in |
Typeface Pica |
| Temperature
|
| Celsius |
C |
1 K -273.15 |
|
| Rankine |
R |
5.0/9.0 K |
|
| Fahrenheit |
F |
1 R -459.67 |
|
| Mass
|
| gram |
g |
0.001 kg |
This is case sensitive. |
| gram |
gm |
g |
(alternate symbol) |
| pound mass |
lbm |
0.45359237 kg |
(avoirdupois) |
| Troy pound |
lbt |
0.3732417 kg |
(apothecary) |
| carat (metric) |
carat |
0.2 g |
|
| slug |
slug |
1 lb sec^2/ft |
|
| snail |
snail |
1 lb sec^2/in |
|
| Short Ton |
ton |
2000 lbm |
|
| Long Ton |
ton_l |
2240 lbm |
|
| Ounce |
oz |
28.34952 g |
(avoirdupois) |
| Grain |
gr |
64.79891 mg |
|
| Pennyweight |
dwt |
1.55174 g |
|
| Force or
Weight |
| Newton |
N |
1 kg m/s^2 |
|
| Dyne |
dyn |
1e-5 N |
|
| pound force |
lb |
lbm G |
|
| pound force |
lbf |
lbm G |
|
| poundal |
poundal |
1 lbm ft/sec^2 |
|
| kilopound |
kip |
1000 lbf |
|
| kilogram force |
kgf |
kg G |
|
|
Energy |
| Joule |
J |
1 N m |
|
| British Therm. Unit |
BTU |
1055.056 J |
(International Table) |
| British Therm. Unit |
Btu |
1 BTU |
alternate symbol |
| British Therm. Unit |
BTU_th |
1054.350 J |
(Thermochemical) |
| calorie |
cal |
4.1868 J |
(International Table) |
| calorie |
cal_th |
4.184 J |
(Thermochemical) |
| Calorie |
Cal |
4.1868 kJ |
(nutritionists) |
| electron volt |
eV |
1.602177e-19 J |
|
| erg |
erg |
1e-7 J |
|
| Ton of TNT |
TNT |
4.184e9 J |
|
| Power
|
| Watt |
W |
1 J/s |
|
| Horse Power |
hp |
550 ft lb/s |
|
| Pressure
|
| bar |
bar |
1e5 N/m^2 |
|
| Pascal |
Pa |
1 N/m^2 |
|
| Pounds per sq. inch |
psi |
1 lb/in^2 |
|
| Pounds per sq. ft. |
psf |
1 lb/ft^2 |
|
| kilo psi |
ksi |
1000.0 psi |
|
| atmospheres |
atm |
1.01325e5 N/m^2 |
|
| inches of Mercury |
inHg |
3.387 kPa |
|
| millimeters Mercury |
mmHg |
0.1333 kPa |
|
| Torr |
torr |
1.333224 Pa |
|
| Volume or
Area |
| Liter |
L |
1/1000.0 m^3 |
|
| gallon |
gal |
3.785412 L |
|
| Pint (U.S. liquid) |
pint |
1/8. gal |
|
| Quart (U.S. liquid) |
qt |
2 pint |
|
| Pint (U.S. dry) |
dpint |
0.5506105 L |
|
| Quart (U.S. dry) |
dqt |
2 dpint |
|
| Acre |
acre |
1/640.0 smi^2 |
|
| Hectare |
ha |
10000 m^2 |
|
| Barrel (petroleum) |
barrel |
158.9873 L |
|
| Fluid Ounce |
oz_fl |
29.57353 mL |
|
| Gill (U.S.) |
gi |
0.1182941 L |
|
| Peck (U.S.) |
pk |
8.809768 L |
|
| Tablespoon |
tbl |
1/32. pint |
|
| Teaspoon |
tsp |
1/3. tbl |
|
| Cup |
cup |
16. tbl |
|
|
Electromagnetism |
| Coulomb |
Co |
1 A s |
Electric Charge |
| Volt |
V |
1 W/A |
Electric Potential |
| Ohm |
ohm |
1 V/A |
Electric Resistance |
| Ohm |
\\Omega |
1 V/A |
alternate symbol |
| Faraday |
faraday |
96485.31 Co |
Electric Charge |
| Farad |
farad |
Co/V |
Capacitance |
| Stokes |
stokes |
1e-4 m^2/s |
|
| Oersted |
Oe |
79.57747 A/m |
|
| Webber |
Wb |
V s |
Magnetic flux |
| Tesla |
Tesla |
Wb/m^2 |
Magnetic flux density |
| Henry |
H |
Wb/A |
Inductance |
| Siemens |
S |
A/V |
Electrical Conductance |
| Light and
Radiation |
| Lux |
lux |
cd/m^2 |
Iluminance |
| Lux |
lx |
cd/m^2 |
|
| Lumen |
lm |
cd |
Luminous Flux |
| Stilb |
sb |
10000 cd/m^2 |
|
| Phot |
ph |
10000 lx |
|
| Becquerel |
Bq |
s^-1 |
activity |
| Gray |
Gy |
J/kg |
Absorbed Dose, kerma |
| Sievert |
Sv |
J/kg |
Dose equivalent |
| Other
Quantities |
| pound mole |
lbmole |
1 mol lbm/g |
quantity |
| poise |
poise |
1 g /sec cm |
viscocity |
| Gravity's accel. |
G |
9.80665 m/sec^2 |
Gravity on Earth |
| Degree |
deg |
Pi/180 |
Can be used to convert
from degrees to radians for trig functions. |
| Percent |
% |
0.01 |
|
| Knot |
knot |
1852 m/hr |
velocity |
| Miles per Hour |
mph |
1 mi/hr |
velocity |
| Gallon/minute |
gpm |
1. gal/min |
flow rate |
| Revolution/minute |
rpm |
360 deg/min |
|
منبع :
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