What is Wet-Bulb Temperature and how does it work?
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If you wrap a thermometer in wet cloth and have air passed over it (By waving it around, or pointing a fan at it) it will show a cooler temperature than if the thermometer is just sitting there dry. It shows what the temperature will feel like for a person that is wet (say, from sweat) and trying to cool off by evaporation. (So if it’s humid out, web bulb temperature will be higher than if it were dry out, because humidity prevents evaporation.)
If the wet bulb temperature is much above about 90 F, people are going to start dying without air conditioners. Even someone who is used to the heat can’t survive that for long.
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