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What is principle of increase of entropy?

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Answer:

There is a rather abstract quantity, called "entropy", that increases in our universe. The mathematical formulation is rather complicated, but here are two alternative formulations:

1) There are irreversible processes in the Universe.

2) Useful energy is continuously converted into unusable energy. In the future, there will be less useful energy available.

First answer by Hilmarz. Last edit by Hilmarz. Contributor trust: 806 [recommend contributor ]. Question popularity: 1 [recommend question].

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