A glass tube of radius r is dipped vertically into a container of mercury of density `rho` with its
Channel: Doubtnut
Date: 2020-08-02

A glass tube of radius r is dipped vertically into a container of mercury of density `rho` with its lower end at a depth h below the mercury surface . If S  is the surface tension of mercury, what must be the gauge pressure of air in the tube to blow a hemispherical bubble at the lower end?