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Ebullism : ウィキペディア英語版
Ebullism

Ebullism is the formation of gas bubbles in bodily fluids due to reduced environmental pressure, for example at high altitude. It occurs because a system of liquid and gas at equilibrium will see a net conversion of liquid to gas as pressure lowers, for example, liquids reach their boiling point at lower temperatures when the pressure on them is lowered.
==Description==
In the atmospheric pressure present at sea level, water boils at 100 °C (212°F). At an altitude of 63,000 feet (18,900 m), it boils at only 37 °C (98.6 °F), the normal body temperature of humans. This altitude is known as ''Armstrong’s Line.''〔Davis, Jeffrey R., Johnson, Robert, and Stepanek,Jan, ''Fundamentals of Aerospace Medicine'', 4th Edition (2008), p. 252.〕 In practice bodily fluids do not boil off at this altitude. This is because the skin and outer organs have enough strength to withstand this pressure,〔Landis, Geoffrey A., "(Human Exposure to Vacuum )" (Retrieved 2010-02-16).〕 thus pressure inside the body would be significantly higher—however, bubbles starting to form is still an issue.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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