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nature : gas or solid-liquid phase change process. Liquefied gas : liquefied gas released when the heat. Cooling subject to the following critical temperature can occur. Available compression or cooling or compressing and cooling methods. The higher critical temperature gases, such as ammonia, chlorine, carbon dioxide, sulfur dioxide and hydrocarbons such as acetylene, and the temperature can be compressed by the liquefaction. The lower critical temperature of gases, such as oxygen, carbon monoxide, subject to compression and cooling can be liquefied. The critical low temperature gases, such as hydrogen, helium, etc., are subject to compression and cooling to near absolute zero temperatures can be liquefied. Liquefied gas of modern science and technology to the development of important significance. For example, can be used as high-energy liquid hydrogen fuel and liquid oxygen system can be used for high-energy explosives and liquid oxygen fuel combustion catalyst, etc..
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