摘要
本文从相律推导出发，考察了如何正确表达相律。建议删除组分数Ｃ的概念，并且用相律解释了临界点的零自由度问题。
From the derivation of the Gibbs phase rule. its expression is studied.It is proposed that thenumber of components C can be omitted to give an alternative expression,The zero degree of freedom atthe critical points is then explained by using the new expression.
