this post was submitted on 02 Mar 2024
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The helium used for balloons is of low purity.
The shortages you hear about are of pure or near pure helium. The stuff going into the balloons at Tommy's birthday party isn't the same thing used to cool superconductors.
EDIT: And I used to think Reddit was full of ignorant jackasses ...
Using it for balloons is still a waste because that impure helium could be purified for better uses.
No, no it could not.
The stuff used in balloons isn't pure enough to be used for cryogenic purposes, which is what people really want it for.
And before you ask purifying it is really difficult.
No helium found on earth ever, was pure enough for cryo. Not even close. All helium is found in low concentrations and spun extracted to concentrate and start to purify it. Then there are additional filter methods to finish concentrating it. Removing the hydrogen is about the hardest because it's also abundant and small and light.
But helium used in balloons can absolutely be concentrated and purified.
hydrogen is the easy one, because you can burn it off on catalytic bed, then pass through bed of 3A MS to trap water. done
separating excess oxygen and nitrogen is easier and there's already some nitrogen (as much as 50%) in crude helium