Verified answer

You cannot form liquid oxygen at 25 degrees C by pressure alone.

The critical temperature is the temperature above which a substance in the gas

phase will remain a gas, regardless of how much it is compressed.

So if oxygen is at a temperature above –118°C cannot be liquefied by

pressure alone; it must be cooled to a temperature below that in order to

make it liquid at any pressure.

Answer choice a is your best answer.

Critical Temperature Of Oxygen

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well theoretically any materiel can attain such properties, but it probably has not been experimented with on more elements then Rubidium and sodium as of yet. but oxygen might not behave in the same manner as does rubidium 87, it will probably form a Bose-Einstein condensate at a slightly higher temperature as Rubidium 87 which is 170nk Einstein once did a thought experiment on condensates, in trying to overcome the Heisenberg uncertainty-principal.