# From Planck's law to derive the stefan Boltzman constant.

1. Dec 8, 2013

### Outrageous

The following is the Planck's derivation for black body radiation
$${\rho}({\lambda}) d{\lambda}=E({\lambda})*f({E(\lambda}))*D({\lambda})d{\lambda}------equation 1$$
$$\int_0^\infty{\rho}({\lambda})d{\lambda}$$ is the density of radiative energy.
From
http://en.wikipedia.org/wiki/Stefan–Boltzmann_law#Derivation_from_Planck.27s_law

"..... is the amount of energy per unit surface area per unit time per unit solid angle emitted at a frequency by a black body at temperature T." From Wikipedia .