Wet bulb temperature is a measure of temperature once as much water has been evaporated as possible as other said, the idea is that it simulate how sweat work.
The danger is when the wet bulb temperature is higher than the temperature of your skin, as it means you can’t cool yourself by sweating, and if you can’t do it another way, you will overheat and pass out, then die.
It’s not the heat, it’s the humidity that’s get you, as they say: as long as it is dry, you can sweat yourself cool as long as your sweat can evaporate
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