Thermal expansion coefficient

The thermal expansion coefficient, $\alpha$ is given by

$\alpha ={\frac {1}{V}}\left.{\frac {\partial V}{\partial T}}\right\vert _{p}$

where $V$ is the volume, $T$ is the temperature and Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle p} is the pressure.