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If the diameter of a soap bubble is 10 m...

If the diameter of a soap bubble is 10 mm and its surface tension is `0.04 Nm^-1`, find the excess pressure inside the bubble.

Text Solution

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Diameter of soap bubble =10 mm
`therefore ` Radius , r=5 mm =`5 times 10^-3 m`
Surface tension , S=`0.04 Nm^-1`
Excess pressure inside the soap bubble,
`P=(4S)/r`
`therefore(4times0.04)/(5times10^3)=160/5=32Nm^-2`
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