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  4. A soap bubble in air (two surfaces) has surface tension 0.03 text Nm-1 . Find the gauge pressure inside a bubble of diameter 30 mm .

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Q. A soap bubble in air (two surfaces) has surface tension $ 0.03\text{ }N{{m}^{-1}} $ . Find the gauge pressure inside a bubble of diameter $ 30\,mm $ .

KEAMKEAM 2004

Solution:

Gauge pressure $ =\frac{4T}{R}=\frac{4\times 0.03}{\frac{30}{2}\times {{10}^{-3}}}=8\,Pa $