A measure of relative media density $\begin{array}{l}\rho\end{array}$ change due to a unit temperature $\begin{array}{l}T\end{array}$ variation:

(1)	$\begin{array}{l}\displaystyle \alpha_V = \frac{1}{\rho} \left( \frac{\partial \rho}{\partial T} \right)_p\end{array}$

Symbol	Dimension	SI units	Oil metric units	Oil field units
$\begin{array}{l}\alpha_V\end{array}$	Θ^-1	K^-1	°C ^-1	°F ^-1

For the Ideal Gas: $\begin{array}{l}\alpha_V = \frac{1}{T}\end{array}$ .

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