شرح قوانين thermodynamic

[عاطف خليفة]

Energy Flux

(1)

The mean energy flux is , also written as and called I, the intensity. For a traveling wave,

(2)

The unit of energy flux is 1 J m-2 s-1 = 1 kg s-3. For radiation, consider a half-plane filled with energy density u, then

(3)

where c is the speed of light, is the angle from the propagation axis, a is the radiation constant, T is the temperature, and is the Stefan-Boltzmann constant












Foot Pound


A unit of energy equal to