An empirical equation with tables of smoothed solubilities of methane in water and aqueous sodium chloride solutions up to 25 weight percent, 360 degrees C, and 138 MPa

The total pressure for the system H 20-CH4 is given by p(total) = p(H 20,t) + exp1Q [log x(CH4 ) -a -b x(CH4 )], where p(H 20,t) is the vapor pressure of FUO liquid at the temperature t (C) and xfCH^) is the molal concentration of methane in the solution. The terms a_ and b^ are functions of temperature only. Where the total pressure and temperature are known, the concentration of methane, xfCH^), is found by iteration.