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Thermodynamics, science of the relationship between heat, work, temperature, and energy. In broad terms, thermodynamics deals with the transfer of energy from one place to another and from one form to another. The key concept is that heat is a form of energy corresponding to a definite amount of mechanical work.

The Laws of Thermodynamics
1st Law of Thermodynamics - Energy cannot be created or destroyed.

2nd Law of Thermodynamics - For a spontaneous process, the entropy of the universe increases.

3rd Law of Thermodynamics - A perfect crystal at zero Kelvin has zero entropy.