Condensation of Humidity Due to Cooling

How Does Water Get Into the Air?

Almost 2/3 of the earth is covered with water. That water, especially from the oceans, evaporates resulting in a constant humidity of the air between 1-5%. During its, ascent, the moist air cools down and a part of the water vapour condenses on particles like soot or salt - clouds are formed.

What Is the Relative Humidity?

The relative humidity is a measure of how close you are to the saturation of the air with water. For humans, a relative humidity between 40 and 70% is comfortable. In winter, it is possible that the humidity will drop below 40% in heated rooms. In that case, a humidifier or wet cloths on the heating can help. The relative humidity is measured with a hygrometer.

What Is the Dew Point?

The dew point is the temperature to which a mass of air has to be cooled for condensation to occur. At that temperature, the relative humidity is 100%.