沸点升高(英语:Boiling-point elevation)指当一种组分加入时,某种液体溶剂)的沸点升高的现象, 即一种溶液具有比纯溶剂更高的沸点。此现象发生于一种难挥发性的溶质(如盐)加入到一种纯溶剂(如)时。溶液沸点升高的原因是溶液的蒸汽压低于纯溶剂的蒸气压。沸点可以用沸点测定器准确测量。

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