Wet bulb temperature describes both air temperature and air humidity, and has emerged as an important metric for measuring human heat stress. When the air's wet bulb temperature becomes higher than our bodies' skin temperature (around 35 degrees Celsius), we can no longer efficiently cool down by sweating. Without the help of air conditioning, a person experiencing such extreme wet bulb temperatures would eventually suffer from heat illness, regardless of how healthy they are!
What controls wet bulb temperature, and how is it different from the air temperature we usually refer to?
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