Question: What are the most interesting properties of sulfer hexafloride.

Struan Simpson answered on 6 Mar 2020:

I’ve never worked with it personally, but I do know it’s quite famous for being sort of like a reverse helium in that it makes your voice deeper when you breathe it in! Otherwise, it’s quite inert so it’s used for example to protect electrical equipment – but I’d definitely say the reverse helium thing is way more interesting!