Abstract
A generalized vapor pressure equation which is applicable to all substances has been developed. In addition to the critical pressure, temperature, and density (or Z c ) it was necessary to introduce two other critical properties: S c , the slope of the critical density isometric for the gas phase; and K, a parameter that relates the apparent slope of the vapor pressure curve at the critical point to the ratio S c |Z c . The equation contains two terms: the first applies to the noble gases and the second to the quantum gases, whereas all other substances contain both terms. For nonpolar and slightly polar substances, the five critical properties can be accurately calculated from vapor pressure and liquid density data in the vicinity of the normal boiling point. For any substance, the accuracy of the equation is comparable to the best available equation developed specifically for the substance
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