In thermodynamics, it is not necessary that the radiative transfer of heat be of pure black-body radiation, nor of incoherent radiation.
en.wikipedia.org At this time the laws of thermodynamics were not adequately understood, particularly the concept of absolute zero.
en.wikipedia.org It applies the principles, practices and concepts of physics such as motion, energy, force, time, thermodynamics, quantum chemistry, statistical mechanics and dynamics, equilibrium.
en.wikipedia.org Following the second law of thermodynamics, entropy of an isolated system always increases.
en.wikipedia.org This can be explained on the basis of irreversible thermodynamics, structural relationships, or a combined consideration of statistical thermodynamics and structural variation with temperature.
en.wikipedia.org