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Cold air cannot hold as much moisture as warm air. If the dew point exceeds the air temperature, fog will form.

You start off with a room at room temperature (about 20 - 25 C, about 70 F).

As you run a shower that produces steam (rather than a cold shower), steam fills the room and condenses on the mirror, because the glass (being a good insulator) does not dissipate heat as quickly. Therefore, it remains at a cool temperature, and allows the water vapor to cool back to liquid water (fog).

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12y ago

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