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Stichwort English Beschreibung
Luftfeuchtigkeit humidity Die Luft weist durch den darin enthaltenen Wasserdampf immer einen gewissen Feuchtegrad auf.

Bei der Luftfeuchte unterscheiden wir:
  • absolute Luftfeuchtigkeit: Gramm Wasserdampf in einem m3 Luft,
  • maximale Luftfeuchtigkeit (Wasserdampfsättigung): bei einer bestimmten Lufttemperatur höchstmögliche Luftfeuchtigkeitsaufnahme,
  • relative Luftfeuchtigkeit: Verhältnis der absoluten Luftfeuchtigkeit zur bei gleicher Temperatur maximal möglichen Luftfeuchtigkeit.

Die Raumluftfeuchtigkeit soll zwischen 30 - 65 Prozent relativer Feuchte liegen. Dieser physiologische Bereich wird in der Raumluft im Allgemeinen eingehalten.

Zu trockene Luft kann im Winter bei lang dauernder Lüftung auftreten, wenn sich die kalte Außenluft, welche absolut nur wenig Luftfeuchtigkeit enthält, erwärmt (Abfall der relativen Luftfeuchte durch Erwärmung der Luft trotz gleichbleibender absoluter Luftfeuchte).

Hohe Luftfeuchte in zu warmen Räumen wird als "Schwüle" empfunden. Mit steigender Lufttemperatur sinkt die Grenze des Schwülebereiches, das heißt es erscheinen schon geringere relative Luftfeuchten als schwül.

Legal and other notes on our real estate lexicon
We do not assume any liability for the correctness of individual terms. We therefore recommend that you do not rely on our lexicon for terms and definitions relevant to decision-making. It serves the general comprehensibility of terms, nomenclature, technical terms, which can be found in real estate-related literature, trade journals or articles in general, as well as in conversation with real estate professionals, correspondence, etc. 

Before making any decision that is in any way relevant to property, we therefore strongly recommend that laypersons consult appropriate experts and do not rely on definitions of terms alone. Also, aspects of building law or neighbourhood law are often a matter for the federal states and may therefore differ from one federal state to the next.

Incorrect definitions, or rather incomplete definitions, cannot be ruled out either. Some terms may have several meanings, while for others there is a different technical term for the same thing. Here, too, national differences cannot be ruled out. Also, the technical language used by architects, construction companies, civil servants or employees in the building industry is not always the same. And some terms - such as living space - have been defined differently at different times; therefore, in case of doubt, it is also advisable to clarify the chronological aspect of the origin of a term.

In any case, we do not assume any liability for damages of any kind that are supposed to originate from a definition of a term on our homepage; except for malicious intent.

The author of the encyclopaedia is Grabener Verlag, which unfortunately no longer provides the online version itself; we have therefore acquired the licence from this publisher to keep it available on our homepage.

We are happy to receive suggestions for additions or corrections. Please write to: elexicon.

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