Surface tension of a water bubble

When we heat water in a vessel, air bubbles are formed at the bottom. These bubbles detach from the base and rise.

Take the bubbles to be spheres of radius RR and making a circular contact of radius rr with the bottom of the vessel. If r<<Rr < < R, and the surface tension of water is TT.

If the density of water is ρ\rho, find the value of rr just before the bubbles detach.

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