Physics
The first law of thermodynamics is simply the case of

Charle's law
The law of heat exchange
Newton's law of cooling
The law of conservation of energy

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Physics
Conservation of energy refers to the fact that

Energy cannot be created or destroyed but can be converted from one form to another
If you conserve energy you will not be as tired
No chemical reaction is 100 percent efficient
The entropy of the universe is always increasing

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