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Definition of First law of thermodynamics

First law of thermodynamics Definition from Science & Technology Dictionaries & Glossaries
Web Dictionary of Cybernetics and Systems
The law of conservation of energy (see thermodynamics). (Krippendorff)
First law of thermodynamics Definition from Encyclopedia Dictionaries & Glossaries
Wikipedia English - The Free Encyclopedia
The first law of thermodynamics is a version of the law of conservation of energy, adapted for thermodynamic systems. The law of conservation of energy states that the total energy of an isolated system is constant; energy can be transformed from one form to another, but cannot be created or destroyed. The first law is often formulated by stating that the change in the internal energy of a closed system is equal to the amount of heat supplied to the system, minus the amount of work done by the system on its surroundings. Equivalently, perpetual motion machines of the first kind are impossible.

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First law of thermodynamics Definition from Language, Idioms & Slang Dictionaries & Glossaries
WordNet 2.0

Noun
1. the fundamental principle of physics that the total energy of an isolated system is constant despite internal changes
(synonym) conservation of energy, law of conservation of energy
(hypernym) conservation