DENSITIES OF (WATER PLUS METHANE) IN THE TEMPERATURE-RANGE 430 K TO 699 K AND AT PRESSURES UP TO 30 MPA

New measurements of the amount-of-substance densities rho of nine mixt ures of (water + methane) are reported in the temperature range 430 K to 699 K at pressures from 7.5 MPa to 30 MPa. The results have been ob tained by using a fully automated isochoric instrument. The uncertaint y in the experimental results is estimated to be about +/-0.0008 .rho at the lowest water content and +/-0.0014 .rho at the highest water co ntent. Comparisons with independent sources of experimental informatio n through a model based on the two-fluid corresponding states principl e are presented. The dew points of the mixtures studied have also been determined and compared with predicted values from the Peng-Robinson equation of state. (C) 1996 Academic Press Limited