### Fundamental Physical Constants

Note: All units are SI (Systeme Internationale)

Gravitational constant = 6.67 x 10^{-11} N m^{2}/kg^{2}
Speed of light = 3 x 10^{8} 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 10^{23} (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.