Wet bulb temperature - why & when is it used?

A wet bulb temperatures is the same as a "regular" temperature, but we wrap a wet rag around the bottom of the thermometer to measure it. But why the heck do we even do this? When is it useful?

Shout out to Themba Khumalo for my awesome artwork.
https://thembakhumaloart.com/
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00:00 We know HOW, but WHY?
00:43 What we know from just a wet bulb
02:03 Wet bulbs are lower than dry bulbs
04:28 Dry & humid days
06:28 Relative & absolute humidity
07:30 Cooling towers

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