Definition: The law which states that the total energy of a system and its surroundings remains constant.
Alternate Definition: The change in the energy of a system equals the heat flow in the system from the surroundings minus the work done by the system on the surroundings. Also known as the Law of Conservation of Energy.
First Law of Thermodynamics Definition
Chemistry Glossary Definition of First Law of Thermodynamics
By Anne Marie Helmenstine, Ph.D., About.com Guide
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