Condensation and Dew Point

Condensation is the process in which gas changes into a liquid when it touches a cooler surface. Condensation is an important part of the water cycle. It is the opposite of evaporation.

condensation on a widow


Condensation of water is when water changes from gas to a liquid or crystal shape. Any gas can condense, usually at a low temperature or high pressure.

During condensation, the molecules in the matter slow down. Heat energy is taken away, causing the state of matter to change.

The dew point is the temperature where water vapor condenses into liquid water.

Dew on a spider web.

All air holds different amounts of water vapor. The dew point shows the amount of moisture in the air. The higher the dew point is, the higher the level of moisture in the air at a given temperature. The dew point of humid air will be higher than the dew point of dry air.

Condensation of water vapor starts when the temperature of air is lowered to its dew point and beyond. At the dew point, the air is saturated, full to the brim of water. Since it’s so full, there’s a lot of pressure. That forces the water to condense, creating condensation. We can see it as dew, drops of water on an object, such as a window, car, grass, or a spider web, like in the picture.

(Edited from source – source)

CC BY-SA 3.0