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A glass capillary contains enclosed air by a thread of mercury 15cm long when the tube is placed horizontally as shown.

i).What is the length of the enclosed air column when tube is vertical with the open end uppermost if the atmospheric pressure is 750mmHg?
ii) Explain why an air bubble increase in volume as it rises from the bottom of a lake to the surface.

Answer Text:
i).P1V1 = P2V2
#24 times 750 = (750 + 15) V2#
V2 = #(24 times 750)/(765)#
V2 = 23.53cm
ii).Pressure in liquids increases with depth the pressure due to water acting on the bubble decreases as the bubble rises