Ebullism is the formation of gas bubbles in bodily fluids due to reduced environmental pressure, for example at high altitude. It occurs because liquids boil at a lower temperature when the pressure on them is reduced. In the atmospheric pressure present at sea level (760 mm of mercury), water boils at 100°C (212°F). At an altitude of 61,000 feet (47 mm pressure) it boils at only 36.7°C (98°F). This is the normal body temperature of humans, but in practice bodily flui… (More on Ebullism)