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Excess Pressure in Bubbles

If an air bub...

Question

If an air bubble rises from the bottom of the lake to its surface at constant temparature, its volume

A

decreases

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B

increases

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C

remain same

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D

can't say

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Solution

The correct option is B increases
We first note that at the bottom of the lake, the pressure is high (because pressure increases with depth).
Also note that since temperature is given to be constant so Boyle's law is applicable.
Now we see that since PV = constant, and as the bubble goes up, pressure decreases so volume must increase.

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