You are using an old browser that may not function as expected. For a better, safer browsing experience, please upgrade your browser.

Log in Become a Member


Designation (also air humidity) for the proportion of water vapour in the gas mixture of the earth's atmosphere or in rooms. Liquid water such as raindrops, fog droplets, ice or snow crystals, however, are not included. Humidity is one of the many factors in weather or in the long-term weather pattern of the climate. From the free water surfaces (rivers, lakes, oceans), individual water molecules always pass from the water volume into the air volume. Absolute humidity is the gaseous amount of water vapour contained in one cubic metre of air, usually expressed in g/m3. The most commonly used measure, however, is relative humidity (RH), which is the ratio of the actual amount of water vapour in the air to the maximum possible amount, measured in %. However, the air can only absorb a limited amount of water vapour. The warmer the air, the higher this saturation amount: at 40 °Celsius 50 g, at 65 °Celsius 200 g and at 100 °Celsius 600 g. When the saturation amount is exceeded, tiny water droplets form by condensation in the form of mist, as well as dew on surfaces close to the ground.

Voices of our members

Andreas Essl

The glossary is a monumental achievement and one of the most important contributions to wine knowledge. Of all the encyclopaedias I use on the subject of wine, it is by far the most important. That was the case ten years ago and it hasn't changed since.

Andreas Essl
Autor, Modena

The world's largest Lexicon of wine terms.

26,028 Keywords · 46,829 Synonyms · 5,324 Translations · 31,363 Pronunciations · 184,895 Cross-references
made with by our author Norbert F. J. Tischelmayer. About the Lexicon