Dew Point (Condensation)

Condensation When water vapor turns into liquid water.

Condensation Remember the actual amount of water vapor in air remains the same unless we change it. If air cools it has less space, making the relative humidity increase. When the air reaches a relative humidity of 100% (saturated) the water vapor will turn into liquid water.

Condensation It is not possible to have air with a relative humidity of more then 100% The liquid water droplets that form on objects are called DEW.

DEW

Dew Point The temperature that air must cool down to reach 100% relative humidity and where water vapor turns into liquid water is called the dew point.

Dew Point The dew point can never be higher then the air temperature – it hasn’t cooled enough for dew to form Or The dew point can equal the air temperature – making dew

Dew Point When you reach the dew point condensation starts and water vapor is removed from the air. If the temperature continues to drop the water vapor is reduces so the dew point drops with the temperature.

Frost When the dew point is below the freezing point of water the water vapor goes directly to a solid: Forming Frost The technical term is sublimation.