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It is called condensation.
The warm, moist air coming from the shower will condense to water droplets on contact with a cool mirror or bathroom window.
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.
When you take a shower the water droplets have a greater surface area then simply having the water sit in the tub as it does in a bath. The leads to increased evaporation. With more moisture in the air it is easier for condensation to occur on a cool surface such as a mirror.
Bathroom tiles get wet in two different ways: water gets splashed, and water condenses, when the air is full of steam (if you are taking a hot shower, for example).
it is because when you take a warm or hot shower, then water that you are using condense it to the air & it covers the mirror of your bathroom.
They form after you wash, take a shower or take a bath because the steam that comes up from the hot water rises and sticks or clings to the mirror and they gather more evaporated water as they go.
The 'fog' is condensed steam. During a hot shower, water evaporates to make steam, and when the steam comes into contact with a cold surface, such as a mirror, then it will cool down and condense back to a thin layer of water.
Because the mirror is colder water vapors are condensed on the mirror.
water energy
Vapor condenses to form liquid. Go to the bathroom and turn on the shower but only the hot water. You'll notice that there's steam/water vapor. Look at your mirror and watch as liquid water forms.
This usually happens after a hot or warm shower because the water vapour in the air becomes a liquid again. It condenses on your mirror. Condensation is taking place!