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  4. A soap bubble formed at the end of the tube is blown very slowly. The graph between excess of pressure inside the bubble with time is

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Q. A soap bubble formed at the end of the tube is blown very slowly. The graph between excess of pressure inside the bubble with time is

Mechanical Properties of Fluids

Solution:

As excess pressure inside the soap bubble of radius $ r $ , is
$ P=\frac{4S}{r} $ or $ P \propto\frac{1}{r} $
Therefore as $ r $ increases with time, $ P $ decreases So the variation of $ P $ with time $ t $ will be a parabolic curve as shown is option $ $