[raydiatian]

100C? Where we boil water? ;)

[MobiusHorizons]

Yes. Actually 100C. The sauna i usually go to goes up to 240F (115C). The reason this doesn’t immediately scald you is that air has a tiny fraction of the specific heat of water, so the energy being transferred to the skin is at a much lower level. You can reject a large portion of this heat by sweating

[jks]

There used to be a Finnish sauna endurance competition where the temperature was 110℃. It was canceled in 2010 after one contestant died.

https://en.wikipedia.org/wiki/World_Sauna_Championships

[MobiusHorizons]

This is a big sauna, most of the air is not at that temperature. And I would certainly not attempt endurance in it, but the thermometer on the wall usually is between 235F and 245F

[KeplerBoy]

It's not an issue. The dry air insulates fairly well, so your body heats up slowly and you can last a few minutes.

[wongarsu]

Also in dry air evaporation cooling is very effective, so sweating gets rid of a lot of the heat before it can build up in your body

[throwaway290]

If you are talking dry air, then how does this apply to wet saunas at 100 degrees?

[KeplerBoy]

afaik there are no humid saunas nearly that hot. You'd have a miserable time in there and even breathing would hurt like hell.

[throwaway290]

Exactly, so here we are talking about dry 100C saunas in replies to someone claiming that Finns sit in wet 100C saunas every week. I find it hard to believe. Humidity makes a massive difference.