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3. Air humidity
Over the whole country, absolute air humidity "W" (figure 9 ) varies relatively little over the course of a season. On average :
in summer: W summer ≈ 12 g/m 3 of air ;
in winter: W winter ≈ 6 g/m 3 of air.
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Air humidity
Water vapor transfer index (WHTI)
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Standards and norms
New standards
- - NF EN ISO 7783-1 - 09.1999
- Détermination du coefficient de transmission de la vapeur d'eau. - NF EN ISO 7783-2 - 07.1999
The first describes the free-foil capsule method. The second determines and classifies water vapour transmission rate (permeability).
They now have the status of French standards and are part of the NF EN 1062-1 to 1062-11...
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