The 1st law of thermodynamics states that the energy in the universe always stays constant.
The law of conservation of energy, that asserts that energy could not be generated or destroyed but could only be transformed from one form to another, serves as the foundation for the first law of thermodynamics.
Our palms grow warm when we rub them together. In reality, this is not generating energy. Our body's chemical energy is transformed by the action of working muscles into work energy in its muscles and subsequently into friction energy in our skin.
Therefore, the 1st law of thermodynamics states that the energy in the universe always stays constant.
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