.TILMedia.BaseClasses.PartialVLEFluidFunctions.vapourIsothermalCompressibility_psxi .TILMedia.BaseClasses.PartialVLEFluidFunctions.vapourIsothermalCompressibility_psxipartial function vapourIsothermalCompressibility_psxi = TILMedia.BaseClasses.PartialVLEFluidFunctionPrototypes.vapourIsothermalCompressibility_psxi;