Water and acetone,CH₃COCH₃,both freeze at a higher temperature under pressure.

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Water freezes at a lower temperature under pressure due to its unique property of expanding upon freezing, which is an exception to the general rule that substances contract when they freeze. Acetone behaves more typically and its freezing point is also slightly lowered under pressure, following the principle described by the Clausius-Clapeyron relation.

Water and Acetone,CH3COCH3,both Freeze at a Higher Temperature Under Pressure

Water and Acetone,CH₃COCH₃,both Freeze at a Higher Temperature Under Pressure