Conversion Factors

Length

1 in = 2.540 cm

1 m = 39.37 in = 3.281 ft = 1.094 yd

1 m = 1015 fm = 1010 Å = 109 nm

1 km = 0.6215 mi

1 mi = 5280 ft = 1.609 km

1 AU = 1.496 x 1011 m

1 ly = 9.461 x 1015 m

1 pc = 3.086 x 1016 m  = 3.26 ly

Volume

1 L = 103 cm3 = 10-3 m3 = 1.057 qt

Time

1 h = 3600 s = 3.6 ks

1 y = 365.24d = 3.156 x 107 s

Speed

1 km/h = 0.278 m/s = 0.6215 mi/h

1 ft/s = 0.3048 m/s = 0.6818 mi/h

Angle-angular speed

1 rev = 2π rad = 3600

1 rad= 57.300

1 rev/min = 0.1047 rad/s

Temperature

TK = TC + 273.15

TC = (5/9)(TF – 32)

TF = 32 + (9/5)TC

Reference: P. Tipler.  Physics for Scientists and Engineers, 5th edition.

Reference: Cox, Arthur, ed., Allen's Astrophysical Quantities, 4th ed., 2000, Springer-New York

Force-pressure

1 N = 105 dyn = 0.2248 lb

1 lb = 4.448 N

1 atm= 101.3kPa = 1.013 bar = 76.00 cmHg = 14.70 lb/in2

Mass

1 u = [(10-3 mol-1)/NA] kg = 1.661 x 10-27 kg

1 tonne= 103 = 1 Mg

1 slug = 14.59 kg

1 kg weighs about 2.205 lb

Energy-power

1 J = 107 erg = 0.7373 ft·lb = 9.869 x 10-3 L·atm

1 kW·h = 3.6 MJ

1 cal = 4.184 J = 4.129 x 10-2 L·atm

1 L·atm = 101.325 J = 24.22 cal

1 eV = 1.602 x 10-19 J

1 Btu = 778 ft·lb = 252 cal = 1054 J

1 horsepower = 550 ft·lb/s = 746 W

Magnetic Field

1 T = 104 G

Angular Measurement

1 degree = 60 arcminutes (arcmin, ' )

1 arcminute  = 60 arcseconds (arcsec, '' )