Given

a mixture of fluid components $\begin{array}{l}C= \{1...n\}\end{array}$ with total mass of each component $\begin{array}{l}m_C\end{array}$ (assumed to stay constant during dynamic processes)

and

fluid phases ( $\begin{array}{l}\alpha = \{1...m\}\end{array}$ ) sharing the same volume under pressure $\begin{array}{l}p\end{array}$ and temperature $\begin{array}{l}T\end{array}$

then in thermodynamic equilibrium the total mass of C-component will decompose into a sum of fluid components:

(1)	$\begin{array}{l}\displaystyle m_C = \sum_\alpha m_{C \alpha} (p,T)\end{array}$

where

$\begin{array}{l}m_{C \alpha} (p,T)\end{array}$

mass of C-component in $\begin{array}{l}\alpha\end{array}$ -phase as a function of pressure $\begin{array}{l}p\end{array}$ and temperature $\begin{array}{l}T\end{array}$

This may alternatively rearranaged as:

(2)	$\begin{array}{l}\displaystyle m_C = \sum_\alpha R_{C \alpha} (p,T) m_\alpha(p, T)\end{array}$

where

$\begin{array}{l}R_{C \alpha} (p,T)\end{array}$	cross-phase exchange coefficient of C-component in $\begin{array}{l}\alpha\end{array}$ -phase as a function of pressure $\begin{array}{l}p\end{array}$ and temperature $\begin{array}{l}T\end{array}$
$\begin{array}{l}m_\alpha(p, T)\end{array}$	total mass of $\begin{array}{l}\alpha\end{array}$ -phase as a function of pressure $\begin{array}{l}p\end{array}$ and temperature

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Cross-phase fluid exchange @model

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