Question

When you blow air on a window pane or mirror why does it become foggy?

Answer 1

Because when we exhale, we don’t just exhale air, we exhale moisture from our lungs. The moisture condenses on the mirror because it normally is much cooler than the air coming from our lungs, causing condensation, much like dew on grass.

Answer 2

Answer:

It becomes foggy because the water vapour in our breath goes to the glass and condenses there

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