From The Collaborative International Dictionary of English v.0.48 [gcide]:
Liquid air \Liq"uid air\ (Physics) A transparent limpid liquid, slightly blue in color, consisting of a mixture of liquefied oxygen and nitrogen. It is prepared by subjecting air to great pressure and then cooling it by its own expansion to a temperature below the boiling point of its constituents (N: -194[deg] C; O: -183[deg] C.). [Webster 1913 Suppl.]
From WordNet (r) 3.0 (2006) [wn]:
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