当饱和蒸气压等于外界压力时，液体开始沸腾，此时对应的温度称为沸点。当饱和蒸气压恰为101.325kpa时，所对应的温度称为该液体的正常沸点
提出一个只由正常沸点和分子式估算烃类物质蒸气压的方法。
A method of predicting vapor pressures of hydrocarbons from the normal boiling points and the molecular formulas is proposed.
本方法所需数据为：液体密度、Z_（RA）值及正常沸点下蒸发焓。
The data required in the method are: liquid density, Z_(RA)and vaporization enthalpy at normal boiling point.
这个参数的值与正常沸点下液体的摩尔体积成正比，且具有基团加和性。
It is found that the parameter is directly proportional to the molar volume of liquid at the normal boiling point, and its values have the additivity of groups.
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