Condensation is the process by which a gas, like water vapor, cools down and changes into a liquid. You can see it as tiny droplets on a cold surface, like a window or a glass of ice water.
From Latin 'condēnsātiō', from 'condēnsāre' ('to make thick, condense'), with 'com-' and 'densus' ('thick'). It entered English in scientific writing to describe gases becoming 'thicker' liquids.
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