on . Posted in Classical Mechanics

Radiant energy, abbreviated as $$E_r$$, a type of kinetic energy that is transmitted without the movement of mass.

$$\large{ E_r = \sigma \; T_a^{4} }$$
$$\large{ E_r }$$ = radiant force $$\large{lbf-ft}$$ $$\large{J}$$
$$\large{ T_a }$$ = absolute temperature $$\large{R}$$ $$\large{K}$$
$$\large{ \sigma }$$  (Greek symbol sigma) = Stefan-Boltzmann constant $$\large{\frac{Btu}{ft^2\;hr\; R^4}}$$  $$\large{ \frac{W}{m^2-K^4} }$$