First law of thermodynamics

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The first law of thermodynamics states that the total energy of the universe is constant. It is an expression of the law of conservation of energy; energy cannot be created or destroyed, only change form.

Note that in a strict sense mass is a form of energy; see this for details.

Another expression of the first law is that a system exchanges energy with its surroundings by transferring heat and doing work.

[edit] See also

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