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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


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.


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.


Is fog hot or cold?

Fog is neither hot nor cold, as it is composed of tiny water droplets suspended in the air. The temperature of the fog will generally be similar to the surrounding air temperature.


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


When you have a cold shower does the bathroom mirror fog up?

No. The steam from a hot shower fogs the mirror.


Does fog form in cold weather?

Yes, fog can form in cold weather. When moist air comes into contact with a cold surface or is cooled to its dew point, it can condense into water droplets suspended in the air, creating fog. Cold weather can enhance the process of fog formation by lowering the temperature of the air and increasing its moisture content, contributing to the formation of fog.


Why do brand new car windows fog up inside in cold weather?

Windows fog because the glass is cold and the humidity is high inside the car. It has nothing to do with the age of the car. Try turning the fan up to circulate the air better, and if that doesn't work, turn the AC on -- but turn the heat up so it doesn't get cold. That will do it for sure.