A small spherical droplet of density d is floating exactly half immersed in a liquid of density ρ and surface tension T. The radius of the droplet is (take note that the surface tension applies an upward force on the droplet):
1
\(\mathrm{r}=\sqrt{\frac{\mathrm{T}}{(\mathrm{d}-\rho) g}}\)
2
\(\mathrm{r}=\sqrt{\frac{3 \mathrm{~T}}{(2 \mathrm{~d}-\rho) g}}\)
3
\(\mathrm{r}=\sqrt{\frac{2 \mathrm{~T}}{3(\mathrm{~d}+\rho) g}}\)
4
\(\mathrm{r}=\sqrt{\frac{\mathrm{T}}{(\mathrm{d}+\rho) g}}\)