Zeroth thermodynamics, first law of thermodynamics second law of thermodynamics.

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Zeroth, first, and second laws of thermodynamics are fundamental principles in the study of energy and heat transfer.

Zeroth law of thermodynamics states that if two systems are in thermal equilibrium with a third system, they are in thermal equilibrium with each other.
First law of thermodynamics, also known as the law of energy conservation, states that energy cannot be created or destroyed, only transferred or converted.
Second law of thermodynamics states that the total entropy of an isolated system can never decrease over time.
Examples: A cup of hot coffee cooling down to room temperature (first law), a refrigerator using energy to keep food cold (second law).

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