(1)	$\begin{array}{l}\displaystyle \ln {\mu}_{12} = x_1 \cdot \ln {\mu}_1 + x_2 \cdot \ln {\mu}_2\end{array}$

where

$\begin{array}{l}\mu_{12}\end{array}$	dynamic viscosity of fluid mixture	$\begin{array}{l}\mu_1\end{array}$	dynamic viscosity of the 1s^t fluid component	$\begin{array}{l}\mu_2\end{array}$	dynamic viscosity of the 2^nd fluid component
		$\begin{array}{l}x_1\end{array}$	mole fraction of the 1^st fluid component	$\begin{array}{l}x_2\end{array}$	mole fraction of the 2^nd fluid component

The most straightforward generalization is provided by Lederer-Roegiers equation.

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See also