【化】 液态空气

[ noun ]
air in a liquid state
<noun.substance>

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.]