Physics - Fluid Question with Solution | TestHub

Water rises up to a height of $4\mathrm{cm}$ in a capillary tube. The lower end of the capillary tube is at a depth of $8\mathrm{cm}$ below the water level. The mouth pressure required to blow an air bubble at the lower end of the capillary will be ' $\mathrm{X}$ ' $\mathrm{cm}$ of water, where $\mathrm{X}$ is equal to