Question

Why is the entropy of a substance taken as zero at 0k?

Answer 1

The third law of thermodynamics states that the entropy of a system at absolute zero is a well-defined constant. This is because a system at zero temperature exists in its ground state, so that its entropy is determined only by the degeneracy of the ground state.

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Answer 2

entropy is taken to be zero cause at 0k the volume occupied by any substance is zero.

no volume means no particles and no particles means no movements no movements mean no disorderness and no disorderness means no entropy

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