Question
A soap bubble expands isothermally and its radius
doubles. The work done by surface tension during this expansion is:ÂSolution
When a soap bubble expands, work is done against surface tension to increase the surface area. A soap bubble has two surfaces (inner and outer), so total surface area is twice that of a single sphere. Let:
- Initial radius =
- Final radius = 2R
- Surface tension = T
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