law of thermodynamics
1. first law of thermodynamics, the principle that in a system of constant mass, energy is conserved.
2. second law of thermodynamics, the principle that the entropy of a closed system increases with time.
3. third law of thermodynamics, the principle that, if two bodies are each in thermal equilibrium with a third body, then they are in thermal equilibrium with each other.
Australian English dictionary. 2014.
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