Verified Answer :

mumsy

Oxygen turns into a liquid at -183 Celsius
to get the oxygen to such a lower temperature, the gas is compressed and then cooled

beanthemachine

Oxygen is like a milder form of nitrogen when it comes to its changing forms.

Oxygen becomes a gas when heated above -183 degrees Celsius, and when it is cooled below -183 degrees Celsius, it becomes a liquid. 

Just as a bonus, the transition between liquid and solid forms happens when Oxygen is cooled below -218.79 degrees Celsius.

So your answer is "the conversion between the liquid and gaseous states of Oxygen." :)

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