Relating to or caused by evaporation; involving the conversion of liquid into vapor.
From 'evaporate' plus the adjectival suffix '-ive,' creating an adjective that describes things related to the evaporation process. This is a standard English word formation pattern.
Evaporative cooling—using evaporation to lower temperature—is how swamp coolers work and how your body cools itself when you sweat; it's one of the most ancient and efficient cooling technologies humans have discovered.
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