Fundamental Physical Constants

Note: All units are SI (Systeme Internationale)

Gravitational constant = 6.67 x 10-11 N m2/kg2

Speed of light = 3 x 108 m s-1

Planck's constant = 6.63 x 10-34 J s

Boltzmann's constant = 1.38 x 10-23 J K-1

Avogadro's number = 6.02 x 1023 (molecules/mole)

Universal gas constant = 8.31 J K-1

Electron charge = 1.60 x 10-19 C

Electron mass = 9.11 x 10-31 kg

Proton mass = 1.67 x 10-27 kg

Permeability of free space = 1.26 x 10-6 H m-1

Permitttivity of free space = 8.85 x 10-12 F m-1



SI UNITS

kg - kilogram (mass)
m - metre (length)
s - second (time)
A - ampere/amp (current)
K - kelvin (temperature)


C - coulomb (charge)
J - joule (energy, work)
N - newton (force)
T - tesla (magnetic induction)
F - farad (capacitance)
H - henry (inductance)



For those interested in the latest and most precise values of the fundamental physical constants, these are maintained by the International Council for Science - Committee on Data for Science and Technology CODATA. They may be accessed directly from NIST.