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Water vapours are condensed on the external surface.

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Q: Why does a cold cups fog up?
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Related questions

Why does windscreen fog up on a cold day?

condensation


Why do eyeglasses fog up when you come inside from the cold?

That is the reaction of the cold lens meeting with the heat from the inside.


Will sunglasses fog up in both cold to warm and warm to cold surroundings?

Yes, they will, because of the sudden change in temperature, a chemical reaction occurs, making the sunglasses fog.


What causes alcohol in a bottle to fog up?

alcohol is basicall condensation it causes fog just like hot and or cold water


Why do car windows fog up?

well it could be because of the heat. if its cold out and you have the heat on in the car, then you will get hot and that will cause the window to fog.


Breathing on a cold window can fog it up which change of state causes this?

Condensation


Is fog hot or cold?

cold


How fog was created?

Fog was created by cold cloud floating up to the sun. The sun doesn't like it so the cloud get spits out and sinks down to the bottom and becomes fog.


Why a bathroom mirror fogged while you take a shower?

Cold air holds less moisture than warm air. When you run the shower with hot water, the moisture condenses on the cold mirror surface causing it to fog up. If you run the shower cold, the mirror will not fog up.


Could fog form on hot nights?

Yes, if there are hot lights out were its cold, chances are they will get fog on them. Yes, if there are hot lights out were its cold, chances are they will get fog on them.


What causes swim goggles to fog up?

water goggles fog up by condensation when the heat is in your goggles its trapped and the plastic probably absorbs the cold in the water


Why do car windows fog up in winter?

moisture from your breathing for example condensing on the cold glass