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Condensation is the process of water vapor turning into liquid water. The stuff you see on your mirror after a hot shower or bath is water not condensation. Condensation is a process and it only happens when the circumstances are right. Three things need to be present in order for condensation to take place.

You need humidity (water vapor in the air), a temperature change (we normally associate condensation with warm water vapor coming in contact with a cool surface), and condensation nuclei. Condensation nuclei is a solid on which condensation takes place. It can be a piece of dust or smoke or it could be a cold window or a cold can of soda pop.