  Analytical considerations and potential flow numerical simulations of the
pinch-off of bubbles at high Reynolds numbers reveal that the bubble minimum
radius, $r_n$, decreases as $\tau\propto r_n^2 \, (-\ln{r_n^2})^{1/2}$, where
$\tau$ is the time to break-up, when the local shape of the bubble near the
singularity is symmetric. However, if the gas convective terms in the momentum
equation become of the order of those of the liquid, the bubble shape is no
longer symmetric and the evolution of the neck changes to a
$r_n\propto\tau^{1/3}$ power law. These findings are verified experimentally.
