N-HEXANE AS A MODEL FOR COMPRESSED SIMPLE LIQUIDS

Isobaric thermal expansivities, alpha(p), of n-hexane have been measur ed by pressure-controlled scanning calorimetry from just above the sat uration vapor pressure to 40 MPa at temperatures from 303 to 453 K and to 300 MPa at 503 K. These new data are combined with literature data to obtain a correlation equation for alpha(p) valid from 240 to 503 K at pressures up to 700 MPa. Correlation equations are developed for t he saturated vapor pressure, specific volume, and isobaric heat capaci ty of liquid n-hexane from 240 to 503 K. Calculated volumes, isobaric and isochoric specific heat capacities, isothermal compressibilities, and thermal coefficients of pressure are presented for the entire rang e of pressure and temperature. The pressure-temperature behavior of th ese quantities is discussed as a model behavior for simple liquids wit hout strong intermolecular inter actions.