when we put air on mirror by our mouth, a cloudy surface spread over the mirror and after sometime it disappear. explain it

The blown air from our mouth contains moisture in the form of water vapours. when we blow air on the mirror surface that being cooler allows the vapours to cool down and hence cloudy surface is formed. With time the cooled vapours get evaporated as room temperature is sufficient to evaporate them hence they disappear.

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