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lazide01/22/20253 repliesview on HN

Nah, that will literally kill any human in potentially minutes. No one can heat adapt to 100F + 95% relative humidity. It literally will cook you dead.


Replies

Taek01/22/2025

Not at all. I've spent plenty of time (sessions exceeding an hour) in saunas that were >105F and >95% humidity (literally so much steam that it was continuously raining from the condensation).

Remember that when you get a fever, your internal body temp can jump to 103+ and stay there for days. Even at a wet bulb temperature above 110, it's going to take time for your internal temperature to heat up to that level. There's nothing "potentially in minutes" about it for humans that are used to the heat.

Sure, you do eventually have to get somewhere cooler. But a wet bulb temperature of 105F is not going to be fatal for a well adapted human even after a few hours.

anymouse12345601/22/2025

Nah. This doesn't pass the smell test.

Throughout much of the Southeastern United States, we regularly see Summer temps above 100F (37C), and humidity up to 90%.

One of the two Marine Corps training bases is in South Carolina where temps and humidity are often near these values and sometimes crest them.

Most of Florida frequently passes these values every Summer.

While it is not comfortable, I can assure you, most humans are able to exert themselves without being killed in minutes from this kind of exposure.

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onlypassingthru01/22/2025

Nope. A human that is regularly exposed to such environments has probably developed a strong cutaneous vasodilation response and can tolerate limited exposure just fine. Instead of a cold plunge in a frozen pond, they're doing a sauna. Human bodies are amazingly adaptable.