liquid air

noun

Definition of liquid air 

: air in the liquid state but usually richer in oxygen than gaseous air that is obtained as a faintly bluish transparent mobile intensely cold liquid by compressing purified air and cooling it by its own expansion to a temperature below the boiling points of its principal components nitrogen and oxygen and is used chiefly as a refrigerant and as a source of oxygen, nitrogen, and inert gases (as argon)

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