How are gases separated for bottling?
Dave - So this is how you separate oxygen from nitrogen in the air or helium. The way that itís done commercially is by cooling air down and all the different gases in air have different points at which they condense so carbon dioxide will come out first, then oxygen, nitrogen and argon. If you slowly cool it down at different temperatures you take out different gases, different liquid gases. Helium isnít found in the atmosphere. You can only find it in the top of oil wells. Itís caused by radioactive decay.
Briana asked the Naked Scientists: how do they separate out gases for air tanks, such as oxygen, argon, nitrogen, or helium tanks? Especially since helium is lighter than, say, oxygen, do they have to go higher into the atmosphere to extract it? What do you think? Briana, Mon, 6th Apr 2009
The gases in air can be separated by their different boiling points.
There's not much helium in air- it dissipates into space. However it is formed deep in the earth by radioactive decay and sometimes it gets trapped in much the same way as natural gas.
It is awosome you know if you can put a rate of 1000000000000000 i will give you more than you want because i tried more than once you should put for example commercials in diffrent web and i promise that will till every body about it omar bilal, Wed, 27th Nov 2013