Wolfram|Alpha Physics

Physical Constants

Constants

get the value of a physical constant
speed of light permeability of vacuum Planck energy classical electron radius Bohr magneton Stefan-Boltzmann constant Schwinger field strength Thomson cross section Landauer conductance geopotential of the earth magnetic flux quantum
specify a constant by symbol
hbar eps_0

Calculations with Constants

do computations involving constants
0.85c Planck mass / mass of electron