Assume all temperatures to be exact, and neglect significant figures for small changes in dimension.
A diver releases an air bubble of volume 4.0 cm3 from a depth of 21 m below the surface of a lake, where the temperature is 9.0 ∘C. What is the volume of the bubble when it reaches just below the surface of the lake, where the temperature is 22 ∘C?
Express your answer using two significant figures.