Why the bubbles exhaled by scuba divers grow as they approaches the surface of the ocean?

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Solution

This can be better understood with the help of Boyle's law which states that-
“Temperature remaining constant, the volume of a given mass of a gas is inversely proportional to its pressure.”
If T= constant
$V is inversaly propotional to \frac{1}{P}$
which means,
$PV = K$
Now we can understand that volume will increase drastically when the pressure will decrease.
In case of the bubbles are exhaled when it comes to the upper surface of the sea the pressure on it becomes low and that is why its volume increases.
Under a sea, the pressure on the bubble is high in comparison to the surface of the sea which is the reason why the volume of the bubble is less underwater.

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