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Smurfdogg asks,

but aren't those tanks now 'watered down' by allowing for more oxygen in the stream in order to eliminate what we're discussing?


I don't know. There has to be a high enough concentration of helium to allow the balloons to float. And you're supposed to put a plastic bag over your head per the peer-reviewed article. The helium rises to the top of the bag and starts to displace the heavier nitrogen and oxygen.

If the stream is "watered down", maybe you need to run it for 15 or 20 minutes without your head in it to give it time to purge the nitrogen and oxygen?

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