Units
From Qwiki
A list of units with conversions and examples. SI units are in parentheses.
Contents |
Mass (kg)
Conversions:
- 1 kg = 2.205 lb
- 1 lb = 0.454 kg = 16 oz
- 1 u = 1.661e-27 kg = 3.662e-27 lb
- 1 slug = 14.59 kg = 32.17 lb
- 1 ton = 907.2 kg = 2000 lb
- 1 metric ton = 1000 kg
Examples (small to big):
- 1.661e-27 kg = 1 atomic unit = 1 u
- 90 kg = 1 large man
- Mass of sun = ...
- etc.
Length (m)
Conversions:
- 1 in = 2.54 cm
- 1 cm = 0.39 in
- 1 ft = 0.305 m
- 1 m = 3.28 ft
- 1 ly = 9.460e12 km
- 1 mil = 25.4 um
- 1 mi = 5280 ft = 1.61 km
- 1 naut mi = 1.151 mi = 6076 ft
- 1 parsec = 3.084e13 km
- 1 fathom = 6 ft
- 1 rod = 16.5 ft
- 1 yard = 3 ft
- 1 fermi = 1e-15 m
- 1 bohr = 5.292e-11 m
Examples:
Time (s)
Conversions:
- 1 d = 86400 s
- 1 y = 3.16e7 s ~ pi e7
Examples:
Energy (J)
Conversions:
- 1 eV = 1.6e-19 J = 3.827e-20 cal
- 1 J = 6.25e18 eV = 0.239 cal
- 1 cal = 4.186 J = 2.62e19 eV
- 1 erg = 1e-7 J = 6.25e11 eV
- 1 kw-h = 3.6e6 J = 2.247e25 eV
- 1 kg = 8.987e16 J = 5.610e35 eV
- 1 BTU = 1055 J = 6.585e21 eV
- 1 food cal = 1000 cal
Examples:
Area (m^2)
Conversions:
- 1 acre = 43,560 ft^2 = (209 ft)^2
- 1 barn = 1e-28 m^2
- 1 hectare = 1e4 m^2 = 2.471 acres
- 1 mi^2 = 2.788e7 ft^2 = 640 acres
Examples:
Volume (m^3)
Conversions:
- 1 L = 1000 cm^3 = 1e-3 m^3
- 1 L = 1.06 qt = 61.02 in^3 = 33.92 oz
- 1 gal=4 qt=8 pints=16 cups=128 oz
- 1 gal = 3.79 L = 231 in^3
Examples:
Speed (m/s)
Conversions:
- 1 m/s = 2.237 mi/h = 3.6 km/h
- 1 mi/h = 1.609 km/h = 0.447 m/s
- 1 km/h = 0.6214 mi/h = 0.2778 m/s
- 1 ft/s = 0.6818 mi/h = 0.3048 m/s
Examples:
Force (N)
Conversions:
- 1 lb = 4.448 N
- 1 N = 0.2248 lb
- 1 dyne = 1e-5 N
Examples:
Power (W)
Conversions:
- 1 hp = 745.7 W
- 1 cal/s = 4.186 W
Examples:
Pressure (Pa)
Conversions:
- 1 atm = 1.013e5 Pa = 760 Torr
- 1 Torr = 133.29 Pa
- 1 Pa = 7.5e-3 Torr
- 1 millibar = 100 Pa
- 1 mm Hg = 1 Torr
Examples:
B (T)
Conversions:
- 1 T = 10000 gauss = 1 Weber m^2
- 1 mT = 10 gauss
Examples:
Magnetic Field Flux (Weber)
Conversions:
- 1 Weber = 1e8 maxwell
Examples:
Links
References
- Back of Halliday, Resnick, Krane, Physics Books.
