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Jozef,
It could be the Joule thompson effect. There is some sort of "triple
point specific to each gas, each mix,  which rules wether your gas heats
up or cools down when expanding, relative to the prssure you are
starting the relevant consideration.
regards 
Matthias

"Gliviak, Jozef" schrieb:
> 
> Hello Guys,
> 
> I've heard a story that some Polish guys were using about 20+ % of He in the
> mix in order to prevent regulator freezing during diving in very cold
> springs (1-3C)in High Tatra mountains. Is there any physical explanation of
> this behavior or it it just a old boys tale ?
> 
> Best regards
> 
>  Jozef Gliviak
>  Slovakia
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