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 .
At higher altitudes, water vapor from ebullism contributes to decompression bubbles of nitrogen gas, causing body tissues to swell up. However, the tissues and skin are strong enough not to burst under the internal pressure of vapourized water. Formulas for calculating standard pressure at a given altitude vary, as do the precise pressures measured on a given day at a specific altitude.