How do you make Oxygen into liquid oxygen?

First, the tanks of "air" that people breathe contain gaseous air (or oxygen) not liquified. scuba tanks are compressed to usually around 3000 psi. (about 200 times the content of atmospheric air for the same volume. No one breathes liquified oxygen because 1) as liquified oxygen turns into gas (ie boils) it consumes a great deal of energy and gets very very cold ( about -300 F) and 2) pure oxygen would be extremely reactive.

Second, the process for filling an "air" tank is via a compressor (such as one you would use to fill your bike tires) except especially designed for breathing air. meaning oil free and with organic vapor and particle filters to purify it so you don't get sick.

Third, to make liquified oxygen, you start with air. Then process it through cryogenic cycles to liquify it. That includes compressing it, exchanging the heat, allowing it to expand adiabatically (without heat exchange), then compressing it again. after a few cycles, you have liquified air. The liquid air is then run through distillation towers that result in a fractional distillation to seperate the oxygen from the nitrogen and other trace components.

How To Make Liquid Oxygen

How Is Liquid Oxygen Made

Liquid oxygen is produced from the air by a process of compression, cooling and expansion until the air condenses at a temperature of -183°C (90 K).

The liquid air is then distilled to produce liquid oxygen by separating it from the other components .. like nitrogen and the noble gases - these are also useful when separated.

The gas in breathing tanks is generally just clean air and will not be in liquid form - too dangerous. It will be at a very high pressure as a gas.

If liquid oxygen is stored in an industrial vessel, the vessel must be specially designed, similar to a vacuum flask and heavily insulated .

The liquid can then be stored at just above atmospheric pressure under a pressure control system. Some losses will occur by 'boil-off' of gas but these will be vented to a flare system or back to the atmosphere. The boil off maintains the oxygen as a liquid at its boiling point at the controlled pressure.

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How do you make Oxygen into liquid oxygen?

You see people with liquid oxygen tanks and in that tank it is supposed to have like 800 times more oxygen than just a tank of oxygen. My freind works on the fire department and he said their air tanks are only good for 20 minutes (and they have the big tanks) because they are just filled with...

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Yes, there is liquid oxygen. The bad news for you is that it exists at ~-118 Degrees Celsius. So, it would be rather destructive to your lungs. Furthermore, Oxygen is toxic to biology at higher concentrations. (oxygen in air is ~20%). Liquid oxygen would be 100% and very toxic. How is it toxic? Well, have you ever heard of free radicals? Oxygen (O2) can form free radicals (O) that damage tissue. So, we have a love/hate relationship with Oxygen. We need it to power aerobic metabolism, but it also is damaging, particularly at higher concentrations. This is why no one dives with pure oxygen in their tanks, and why if you ever have a long hospital visit in which they are giving you oxygen, your throat becomes very raw and irritated. Now, what you saw in the "the abyss" is true, but it is not liquid oxygen. It is a fluorocarbon saturated with oxygen. I remember seeing rat experiments on a video once where they submerged a rat in this stuff and the thing tried to swim to the surface, but never drowned. I've heard that the big problem with this substance is that it strips the thin layer of special liquid that coats the inside of your lungs. This liquid prevents your internal lung structure from collapsing and provides a moist means for diffusing oxygen from air into your blood. So, if you take an animal out of the fluorocarbon, it would die after clearing the liquid from its lungs.

All gases can be converted into liquids by increasing their pressure with a positive displacement pump expelling a lot of heat, some of them in some stages depending of the enthalpy of the gas, reversal can be achieved passing the liquefied gas trough a device named vaporizer which is something similar to a car radiator and a expansion valve absorbing a lot of heat, the heat transference makes the molecules be more apart among them and form the gas stage again, this phenomenon is the basis of the refrigeration principles.

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You have to put it under pressure and chill it.

PV=nRT