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An air bubble of volume 1 cm 3 rises from the bottom of a lake 40 m deep to the surface at a temperature of 12°C. The atmospheric pressure is 1 × 10 5 Pa, the density of water is 1000 kg/m 3 and g = 10 m/s 2 . There is no difference of the temperature of water at the depth of 40 m and on the surface. The volume of air bubble when it reaches the surface will be

1. 2 cm 3
2. 3 cm 3
3. 4 cm 3
4. 5 cm 3

Correct answer: 5 cm 3

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