Constants and Conversions
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Constants

Universal Gravitational Constant G 6.67 10-11 N m2/kg2
Ideal Gas (or Boltzmann’s) Constant k 1.38 10-23 Joule/K
8.62 10-5 eV/K
Stefan-Boltzmann Constant s 5.67 10-8 W/m2 K4
Gas Constant R 8.31 J/mol K

Avogadro’s Number

NA

6.02 1023 molecule/mol

Coulomb Force Constant k 9.00 109 N m2/C2
Fundamental Charge e 1.60 10-19 C
Speed of Light in vacuum c 3.00 108 m/s
Planck’s Constant h 6.626 10-34 J s
Planck’s Constant/2p 1.055 10-34 J s
Rydberg (Bohr atom) constant R 1.1 107 m-1

Some Physical Properties

Density of Water rH2O 1 g/cm3
1000 kg/m3
Speed of Sound in dry Air at 1 atm and 20C 343 m/s
in Water at 1 atm and 20C 1460 m/s
Earth’s Gravitational Acceleration g 9.81 m/s2
Earth’s Radius rE 6.37 106 m
Earth’s Mass mE 5.98 1024 kg
Earth-Sun Distance (mean) 1 AU 1.49 108 km
Earth-Moon Distance (mean) 3.80 105 km
Electron Rest Mass me 9.11 10-31 kg
Proton Rest Mass mp 1.67 10-27 kg

Some Unit Conversions

1 mile = 1609 m 1 meter = 3.28 ft 1 in = 2.54 cm
1 mph = 0.447 m/s 1 day = 86400 sec 1 year = 3.16 107 sec
p Radians = 180 degrees 1 mm Hg = 133 Pa 1 atm = 1.01 105 Pascals
1 N = 0.225 lb 1 kg weighs 2.21 lb 1 Horsepower = 746 W
1 Joule = 0.239 cal 1 eV = 1.60 10-19 J

Compiled by J. Brennan, DVC Physics Dept. 1988. Please inform me of errors.

 

Boise State University

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Copyright 2000-2001
  James W. Brennan
Selland College of Applied Technology
Boise State University

Last Updated 07/08/04 by JWB