Dielectric Constant of N-Hexane as a Function of Temperature, Pressure, and Density.

Abstract

A description is given of apparatus employing a cell that is both a bellows dilatometer and a three-terminal electrode set for measuring simultaneously the density and dielectric properties of liquids as functions of temperature and pressure. Measurements are possible at temperatures from 120 °K to over 300 °K and pressures from 1 to 2000 atm with an uncertainty of 0.03 percent. The density, dielectric constant, and Clausius-Mossotti function of n-hexane have been measured for temperatures from 223 to 298 °K (-50 to 25 °C) and at pressures from 1 to 2000 atm. There is a linear decrease in the Clausius-Mossotti function with density and a decrease with temperature corresponding to an effective dipole moment of 0.085 debye.