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The moist you are talking about is nothing but the water vapour that one releases, every time one exhales. As already know, when we breathe in, the air that enters gets humidified as it passes through the nasal passages. Hence, the air exhaled, or breathed out, contains considerable percentage of water vapour.

Now, this water vapour exhaled out, initially is at body temperature, i.e., 37.5*C. On coming out through exhalation, the vapour soon cools down and condenses on the nearby mirror glass surface.

Hence, the moist is seen.

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Q: Why does moist in the mirror after you blow it?
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Why does moist form on the suface of the mirror after you blow on it?

The mirror get "moisturized" when you blow on it since your breath has water vapors in it. Once you breathe or blow onto the mirror, the water vapors from your mouth go onto the mirror and cool down, causing it to look like a cloudy surface.


When we blow air onto to the mirror the image in the mirror was not clear?

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How can you make condensation using mirrors?

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