Heat flows have laws {thermodynamics laws}. When heat becomes another energy type or another energy type becomes heat, total energy does not change {energy conservation, first law} {first law of thermodynamics}. Heat flows from objects with higher temperature to objects with lower temperature, and energy must make heat flow from cold object to hot object {second law of thermodynamics}. Entropy is zero at absolute zero temperature {third law of thermodynamics}, because random motion is zero and system has complete order. Two systems in thermal equilibrium with third system have same temperature {zeroth law of thermodynamics}.
Physical Sciences>Physics>Heat>Thermodynamics
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Date Modified: 2022.0224