The New Dictionary of Cultural Literacy, Third Edition. 2002.
thermodynamics
The branch of physics devoted to the study of heat and related phenomena. The behavior of heat is governed by the three laws of thermodynamics: (1) The total energy of an isolated system cannot change; this is the law of conservation of energy. (2) Heat will not flow from a cold to a hot object spontaneously (seeentropy). (3) It is impossible, in a finite number of operations, to produce a temperature of absolute zero.