安托萬方程(Antoine equation)是工程上廣泛使用與實驗數據吻合較好的經驗方程

其中:

P指蒸汽壓,單位為 mmHg。
T指溫度,單位為 ℃
A、B、C是與物質相關的特性常數,使用該方程要注意溫度適用範圍。

計算水之蒸汽壓時, A = 8.07131, B = 1730.63, C = 233.426。

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