Forces and Pressure in Physics

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While scuba diving, a girl notices air bubbles underwater. She observes that the size of a bubble is small when it is deep underwater. But the size increases as it moves upwards. What could be the reason behind the increase in size of the bubble?

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More air enters into the bubbles from top

Due to friction

Due to gravity

Due to decrease in pressure applied by water on air bubbles

Due to dissolved oxygen more at the surface

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