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mathematics - تبدیل واحد ها

تبديل واحدهاي مهم 

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