Question

The excess pressure across a soap bubble of radius r is p=4sigma/r where sigma is the surface tension of soap solution what is tge excess pressure across an air bubble of the same radius f formed inside a container of soap solution

Answer 1

The excess pressure across an air bubble of the same radius r formed inside a container of soap solution is 2σ/r.

Explanation:

• A soap bubble has two surfaces while floating in air.
• Whereas air bubble has only one surface in the solution of soap.
• Therefore air bubble has half of the excess pressure of soap bubble in air in soap solution.

Thus

= 1/2  ×   4σ/r

= 2σ/r

Hence the excess pressure across an air bubble of the same radius r formed inside a container of soap solution is 2σ/r.

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