At higher altitudes water vapour from ebullism will add to the decompression bubbles of nitrogen gas and cause the body tissues to swell up, though the tissues and the skin are strong enough not to burst under the internal pressure of vapourised water. Formulas for calculating the standard pressure at a given altitude vary—as do the precise pressures one will actually measure at a given altitude on a given day—but a common formula shows that 6.3 kPa is typically found at an altitude of .
The text describes how water vapor at high altitudes can cause a buildup of pressure in the body due to ebullism, resulting in tissue swelling. It also mentions that the body's tissues and skin are strong enough to resist bursting under the pressure. The calculation of standard atmospheric pressure at different altitudes is mentioned as well.