= Bond number
{c}
{title2=$\mathrm{Bo}=\Delta\rho\,g\ell^2/\gamma$}
{wiki}
= Eotvos number
{c}
{synonym}
The Bond number compares hydrostatic stress over a length $\ell$ with capillary stress. For a gas bubble of radius $a$ and negligible density, $\mathrm{Bo}=\rho ga^2/\gamma$. Small Bond number is the usual sufficient criterion for capillarity to resist gravity-scale deformations. For the clean-bubble terminal speed, the <capillary number> is $\mathrm{Ca}=\mu U/\gamma=\mathrm{Bo}/3$.
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