# OEConst¶

This namespace contains constants.

c

The speed of light in $$meters/second$$.

h

The Planck’s constant in $$J*s$$ (joule-seconds).

hbar

The reduced Planck constant which is equal to the Planck constant divided by (or reduced by) $$2\pi$$.

NA

The Avogadro constant in $$mol^{-1}$$.

k

Boltzmann constant in $$JK^{-1}mol^{-1}$$.

e

The elementary charge in $$coulombs$$.

R

The gas constant in $$JK^{-1}$$.

me

The electron mass constant in $$kg$$.

mp

The proton mass constant in $$kg$$.

mu

The atomic mass constant in $$kg$$.

eps0

The electric constant (vacuum permittivity) in $$C^2*N^{-1}*m^{-2}$$

cal2J

The thermodynamic calorie to Joule factor.