Heliox doesn’t denote a specific concentration of helium and oxygen; even just w... | Hacker News

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johncolanduoni on Oct 31, 2018 | parent | context | favorite | on: iPhones are allergic to helium

Heliox doesn’t denote a specific concentration of helium and oxygen; even just within diving the mix varies depending on the depth it is to be used at.

jsjohnst on Oct 31, 2018 [–]

Correct! A common ratio for deep diving is 12/88, but 21/79, 30/70 and 40/60 are also used at less depth.

In fact, Heliox would usually not be used for dives to 200m due to HPNS risk. Usually it would be Trimix for that.

Either way, GP is mostly wrong on the points they made.

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