How do people get pure gases? (e.g, a helium tank for balloons)
In: Physics
In some cases you can use a selective membrane to separate gases. I did a lab in school where we fed compressed air through a membrane and (i believe) nitrogen permeated out the shell-side since it’s smaller, and oxygen went straight through the tube.
From [wikipedia](https://en.wikipedia.org/wiki/Membrane_gas_separation#Uses) other membrane separations include:
* The separation of nitrogen or oxygen from air (generally only up to 99.5%)
* Separation of hydrogen from gases like nitrogen and methane
* SO2, CO2, H2S, H2O, NH3 separations from other components
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