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The second law explains entropy in regards to a system. The total entropy of an isolated system can never decrease over time, and is constant if and only if all processes are reversible. This is used describe spontaneity in a system or if a reaction is favorable. The equations dealing with entropy help prove this law.
There are more ways that the energy can exist in the high entropy state than in the low entropy state. The second law in fact requires the first law to be true, otherwise entropy could spontaneously decrease in a process that destroys energy.
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