Experimental melting and vapor pressures of methane

The Atmosphere and Internal Structure of Saturns's Moon Titan, a Thermodynamic Study

“…The saturation pressures of methane and nitrogen at 93 K are (Prydz & Goodwin, 1972;Wagner & de Reuck K. M., 1996;Span et al, 2001):…”

Densities of compressed liquid methane, and the equation of state

“…Reviews of thermophysical properties [1,2]1 show that densities available for the co mpressed liquid at low temperatures [3,4] are not of the precision desired for thermal computations. Quite recently we have formulated available coexistence data [5,6], and we hav e measured the melting-and vapor-pressures of methane [7].…”

“…Methane from a commercial supplier is the same lot used for P(T) measurements on the two·phase boundaries [7]. It was specified to be 99.99 percent pure, the principal impurities being N2 , CO2 , and C2H6 .…”

“…used for extrapolation to the P (T) melting-and vaporpressure lines of [7] respectively. Adjustment is made for the negligible c hange of den sity over the range of extrapolation.…”

“…On the melting line , we obtain three densities to a maximum pressure of 220 bar. On the vapor press ure line , we obtain 19 densities to a maximum temperature of 175 K. Vapor densities are obtained by use of the virial equation of [5] and vapor pressures of [7] to a maximum temperature of 175 K.…”