Chemistry / Chem 2077 · Atom · ~20 seconds
Entropy Trend Across Phases
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For a given substance, gas-phase entropy exceeds liquid-phase entropy, which exceeds solid-phase entropy, since particle positions become progressively less constrained.
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Water vapor has higher entropy than liquid water, which has higher entropy than ice, all at the same substance and comparable conditions.
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Mass alone does not set this ranking — phase constrains available microstates far more than a molecule's size does.