Measurements of the (p, #rho#, T) relation of methane and carbondioxide inthe temperature range 240 K to 520 K at pressures up to 30 MPa using a new accurate single-sinker densimeter

摘要

Comprehensive (p, #rho#, T) measurements on pure methane (159 values) and pure carbon dioxide (118 values) have been carried out inthe temperature rang 240 K to 520 K at pressures up to 30 MPa. The measurements were performed by means of a single-sinker densimeter that is based on Archimedes' buoyancy principle. The total relative uncertainty of the measurements in the density #rho# was estimated to be <= | (1.5 to 2)·10~(-4)·#rho#| for methane and <= | (2 to 3)·10~(-4)·#rho#| for carbondioxide. The measurements are compared with previous results of other experimentalists and with values calculated from current equations of state. Morevoer, previously unpublished reslts of (p, #rho#, T) measurements on carbon dioxide (29 values) and methane (53 values) are listed in the appendix