Physical Constants
Speed of light c = 3.00 × 10 cm s
Gravitational constant G = 6.67 × 10 gm cm s
Planck's constant h = 6.63 × 10 erg s

= h / (2 × )
Mass of proton m = 1.67 × 10 gm
Mass of electron m = 9.11 × 10 gm
Charge of electron e = 4.80 × 10 gm cm s
Boltzmann's constant k = 1.38 × 10 egs K
Radiation constant a = 7.56 × 10 egs cm K
Stefan-Boltzmann constant sigma = 5.67 × 10 erg cm s K
Electron volt eV = 1.60 × 10 egs
Rydberg constant R = 2.18 × 10 erg = 13.6 eV
Fine structure constant alpha = 7.30 × 10
= 1 / 137
Avagadro's number N = 6.023 × 10

Conversion Factors
year = pi × 10 s
parsec = 3.26 light-year
m s = 2.24 mile hour
kgm = 2.20 pound
erg = 1 gm cm s
erg = 10 Joule
dyne = 10 newton