It’s about the combination humidity and temperature. For instance, I’ve been to Egypt in the desert where it’s super hot, but also bone dry. Your sweat evaporates which causes cooling (evaporation costs energy). I’ve also been to Thailand in the hottest months, which is cooler than Egypt, but super moist. My sweat would not evaporate which made me feel so much more hot.
When the temp is above bodytemp and the humidity is high enough you will overheat.
Sweating cools you by taking heat away from you as moist vapor. When the air is already full of as much moisture as it can hold, sweating no longer works to cool you down — But your body keeps sweating in an attempt to cool down. You dehydrate, overheat, and die.
I don’t understand. I’ve been in 100+ degree weather often and been fine
It’s about the combination humidity and temperature. For instance, I’ve been to Egypt in the desert where it’s super hot, but also bone dry. Your sweat evaporates which causes cooling (evaporation costs energy). I’ve also been to Thailand in the hottest months, which is cooler than Egypt, but super moist. My sweat would not evaporate which made me feel so much more hot.
When the temp is above bodytemp and the humidity is high enough you will overheat.
Sweating cools you by taking heat away from you as moist vapor. When the air is already full of as much moisture as it can hold, sweating no longer works to cool you down — But your body keeps sweating in an attempt to cool down. You dehydrate, overheat, and die.