Liquid-air meaning

Air in its liquid state, intensely cold and bluish, obtained by cooling and compression.
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Air brought to a liquid state by being subjected to great pressure and then cooled by its own expansion to a temperature below the boiling point of its main constituents, nitrogen and oxygen: it is used as a refrigerant.
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Air which is in a liquid state due to being pressurised or kept at a low temperature, or both, usually for storage and transport purposes.
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