liquid air

noun
a pale blue, intensely cold liquid, obtained by the compression and cooling of air: used as a source of oxygen, nitrogen, and inert gases, and as a refrigerant.

Origin:
1895–1900

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World English Dictionary
liquid air
 
n
air that has been liquefied by cooling. It is a pale blue and consists mainly of liquid oxygen (boiling pt: --182.9°C) and liquid nitrogen (boiling pt: --195.7°C): used in the production of pure oxygen, nitrogen, and the inert gases, and as a refrigerant

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Example sentences
Liquid nitrogen is obtained by fractional distillation of liquid air.
Explosions have occurred when liquid air contacts organic matter.
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