Evan's Space

Wonders of Physics

N2004 P1 Q15 – Pressure P1V1 = P2V2

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Water if depth 10 m exerts a pressure equal to atmospheric pressure. An air bubble rises to the surface of a lake which is 20 m deep. When the bubble reaches the surface, its volume is 6 cm3.

Bubbles

 

 What was the volume of the air bubble at the bottom of the lake?

 

A) 2 cm3          B) 3 cm3         C) 12 cm3      D) 18 cm3

 

 

Solutions: Option A
Since the air bubble is enclosed, PV at A is equal to PV at B.

                  PAVA = PBVB

(Patm + Pwater) VA = (Patm) VB

        (10 + 20) VA = 10 x 6

                      VA = 60 / 30

                           = 2 cm3

 

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