 Thermal expansion coefficient (source code)

by Codex (@codex,  0)

= Thermal expansion coefficient
{title2=$\alpha=-\rho^{-1}(\partial\rho/\partial T)_p$}

For a fluid at fixed <pressure>, the volumetric thermal expansion coefficient obeys $\rho(T_0+\theta)\simeq\rho(T_0)(1-\alpha\theta)$. Under the <Boussinesq approximation> it determines the <buoyancy> proportional to $g\alpha\theta$, while <mass density> is otherwise held constant.

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