Question

Why water vapour deposits on a mirror if we breathe out on it?​

Answer 1

As mentioned earlier the air which we breathe in contains 0.05% water vapor. Therefore, the film of moisture formed on the mirror surface is because of the water vapor content in the air. ... This is because our cells use oxygen from the inhaled air to release energy and give out carbon dioxide as a byproduct.

Answer 2

The answer is: Our warm moist breath leaves a deposit of fine dew like particles on the glass - the glass turns misty. This is because of condensation. The air that we breathe has water vapour. When we blow it out and it comes into contact with a cool surface, the vapour condenses into water droplets.

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