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\rho = \frac{P}{R \, T} \cdot \sum_\alpha \ x_\alpaalpha \cdot M_\alpha |
where
The relative density then can be found as:
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\gamma = M_{\rm ref}^-1 \sum_\alpha \ x_\alpaalpha \cdot M_\alpha |
where
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| body | --uriencoded--M_%7B\rm ref%7D |
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is the
molar mass of the reference fluid (usually, water or air depending on the context).
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The usual practice is to calculate the fluid mixture density at STP and then use pressure-density correlations to predict its properties at various temperature and pressure.
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