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Expansion ratio : ウィキペディア英語版
Expansion ratio
The expansion ratio of a liquefied and cryogenic substance is the volume of a given amount of that substance in liquid form compared to the volume of the same amount of substance in gaseous form, at room temperature and normal atmospheric pressure.
If a sufficient amount of liquid is vaporized within a closed container, it produces pressures that can rupture the pressure vessel. Hence the use of pressure relief valves and vent valves.〔(Safetygram-27 Cryogenic Liquid Containers )〕
The expansion ratio of liquefied and cryogenic from the boiling point to ambient is:
*nitrogen 1 to 696
*liquid helium 1 to 757
*argon 1 to 847
*liquid hydrogen 1 to 851
*liquid oxygen 1 to 860
*Neon has the highest expansion ratio with 1 to 1438.〔http://www.chemistry.ohio-state.edu/ehs/handbook/gases/cryosafe.htm〕〔(Cryogenic liquids-characteristics )〕
==See also==

*Liquid-to-gas ratio
*Boiling liquid expanding vapor explosion
*Thermal expansion

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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