Find the excess pressure inside

Question:

Find the excess pressure inside

(a) a drop of mercury of radius $2 \mathrm{~mm}$

(b) soap bubble of radius $4 \mathrm{~mm}$ and

(c) An air bubble of radius $4 \mathrm{~mm}$ formed inside a tank of water.

Surface tension of mercury, soap solution and water are $0.465 \mathrm{~N} / \mathrm{m}, 0.03 \mathrm{~N} / \mathrm{m}$ and $0.076 \mathrm{~N} / \mathrm{m}$ respectively.

Solution:

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