12 A diver under water uses breathing apparatus at a depth where the pressure is 1.25 x 105 Pa.
A bubble of gas breathed out by the diver has a volume of 20 cm³ when it is released. The bubble
moves upwards to the surface of the water.
At the surface of the water, the atmospheric pressure is 1.00 x 105 Pa.
The temperature of the water is the same at all depths.
What is the volume of this bubble when it reaches the surface?