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\rho(p, T) = \frac{ M_{rw} \rho_w + M_{ro} (1 + R_{sn}) \rho_o + M_{rg} (1+R_{vn}) \rho_g }{ M_{rw} + M_{ro} (1 + R_{sn}) + M_{rg} (1+R_{vn}) }
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This concept gives more wightweight to phases with higher relative phase mobilities.
This normally finds application in multi-phase pressure diffusion where more agile phase contributes more to average phase pressure variation.