Vapor pressures and boiling points of sixty API-NBS hydrocarbons

Abstract

Measurements of vapor pressures and boiling points, over the range 48 to 780 millimeters of mercury, and above about 11 0 C, were made on 60 purified hydrocarbons. The apparatus consisted of an electricall y heated boiler, a vapor space with a vertical reentrant tube containing a platinum thermometer having a resistance of 25 ohms, and a condenser. Measurements of the temperat ure of the liquid-vapor equilibrium were made at 20 fixed pressures maintained automaticall y. The values of the fixed pressures were determined by calibration of the apparatus with water using the vapor pressure-temperature tables prepared at this Burcau.