= Pressure-area law of a collapsible tube
{title2=$p-p_e=\widetilde P(\alpha),\quad c^2=\alpha\widetilde P'(\alpha)$}
The <pressure-area law of a collapsible tube> describes transverse mechanical equilibrium of a deformable tube wall. On a stable branch $\widetilde P'(\alpha)>0$. Linearizing mass and momentum conservation about a stationary uniform tube gives the displayed <wave speed>. External <pressure> is prescribed separately and is not part of the elastic wall stiffness.
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