MEASUREMENTS OF THE (PRESSURE, DENSITY, TEMPERATURE) RELATION OF METHANE IN THE HOMOGENEOUS GAS AND LIQUID REGIONS IN THE TEMPERATURE-RANGE FROM 100-K TO 260-K AND AT PRESSURES UP TO 8 MPA

Comprehensive (p, ρ, T) measurements on pure methane have been carried out on 15 isotherms in the homogeneous gas and liquid region (270 values). The new results reported in this paper cover the temperature range from 100 K to 260 K at pressures up to 8 MPa. The total relative uncertainty in density is <|0.00025| with the exception of the critical region. Comparisons with experimental results of previous workers are presented. Using the new results, the second and third virial coefficients have been determined with an uncertainty of <|0.3 cm3 · mol-1| and <|250 cm6 · mol-2|, respectively. © 1992 Academic Press Limited All rights reserved.