Why does heat flow from the hot corn to the cold butter, and not in the other direction? Although it is an everyday observation, the unidirectional nature of heat flow is one of the great puzzles of the physical world. Very few people understand why heat always flows from hot to cold. Thermal physics explains the puzzle by introducing precise formulations and descriptions of the concepts of heat, energy and temperature. When properly defined and formulated, these concepts lead to a deep understanding that is summarized by the Second Law of Thermodynamics.

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