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[–][deleted] 2 insightful - 2 fun2 insightful - 1 fun3 insightful - 2 fun -  (2 children)

We already do in the form of O2 tanks. Not exactly air (N2 is the major component of the mix anyway), but you get my drift.

[–]literalotherkinNorm MacDonald Nationalism 4 insightful - 2 fun4 insightful - 1 fun5 insightful - 2 fun -  (1 child)

You pay for those tanks because of the labour and engineering involved in creating them not for the gas itself.

[–]casparvoneverecBig tiddy respecter 3 insightful - 2 fun3 insightful - 1 fun4 insightful - 2 fun -  (0 children)

To an extent even for the gas because it requires a complex industrial process of liquefaction and distillation to separate N2 from O2. But that's the catch. You don't have pure O2 in nature. You have to process it through labor and its scarce.