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Second Law of Thermodynamics

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What is Second Law of Thermodynamics?

The second law of thermodynamics states that in any spontaneous process, the total entropy of the universe (system + surroundings) always increases. Equivalently, heat does not spontaneously flow from a cold object to a hot object. The law implies that no heat engine can be 100% efficient. Entropy is a measure of disorder or dispersal of energy, and the second law provides the 'arrow of time' in thermodynamics.

Key Facts

Term Second Law of Thermodynamics
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Frequently Asked Questions

The second law of thermodynamics states that in any spontaneous process, the total entropy of the universe (system + surroundings) always increases. Equivalently, heat does not spontaneously flow from a cold object to a hot object. The law implies that no heat engine can be 100% efficient. Entropy is a measure of disorder or dispersal of energy, and the second law provides the 'arrow of time' in thermodynamics.

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