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second law of thermodynamics
a law stating that mechanical work can be derived from a body only when that body interacts with another at a lower temperature; any spontaneous process results in an increase of entropy
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third law of thermodynamics
law stating that the entropy of a substance approaches zero as its temperature approaches absolute zero
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zeroth law of thermodynamics
the law that if two bodies are in thermal equilibrium with a third body then the first two bodies are in thermal equilibrium with each other
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conservation of energy, first law of thermodynamics, law of conservation of energy
the fundamental principle of physics that the total energy of an isolated system is constant despite internal changes
