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In Chapter 19 we shall learn that an overpressure of only 20 Pa corresponds to the threshold of pain for intense sound. Yet a diver 2 m below the surface of water experiences a much greater pressure than this (how much?) and feels no pain. Why this difference?
The pressure underneath the water depends upon the depth of the water. It is known that the overpressure of 20 Pa corresponds to the threshold of pain for intense sound. This means the human ear can tolerate up to 20 Pa of pressure. Pressure is a scalar quantity and it is felt by the diver from all directions inside the water. The greater pressures which are acting from all directions on the diver cancel out. Thus, the diver feels no pain.
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