# Molecular forces exist between the molecules of a liquid in a container. The molecules on the surface have unequal force leading to a tension on the s

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Molecular forces exist between the molecules of a liquid in a container. The molecules on the surface have unequal force leading to a tension on the surface. If this is not compensated by a force, the equilibrium of the liquid will be a difficult task. This leads to an excess pressure on the surface. The nature of the meniscus can inform us of the direction of the excess pressure. The angle of contact of the liquid decided by the forces between the molecules, air and container can make the angle of contact.
If the excess pressure in a soap bubble is p, the excess pressure in an air bubble is
A. p/2
B. p
C. 2p
D. 4p

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In soap bubble, there will be two free surfaces. So, excess pressure will be double than that in an air bubble. So, air bubble is p//2.