Evaporation cools because the water taking the heat from your skin to turn to vapour feels like the fan on my sweat-sopped shirt in this Chennai godown. The four factors they teach are surface area, temperature, humidity, and wind speed. But in this air so thick you can drink it, the humidity defeats all the others—no breeze, no matter how hot, brings real relief. It’s why the night watchman’s wet gamocha on his neck is wiser than any textbook.
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