Heat is a form of energy (thermal energy) derived from the temperature difference between a body and its surrounding system. Accordingly, the principle of the conservation of heat is implied by the conservation of energy contained in the first law of thermodynamics that states that energy cannot be created or destroyed, merely transformed from one form to another.

Thermodynamics is the study of the transformation of energy. Thermodynamics deals with quantities of energy and entropy known as state functions. The first law of thermodynamics states that energy is conserved; it can neither be created nor destroyed. The second law of thermodynamics states that, in a isolated system, entropy, a measure of amount of energy in a system unavailable to do work, must increase as time passes. The third law of thermodynamics states that the entropy of a perfect crystal is zero when the temperature...