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Luftfugtighed - Wikipedia, den frie encyklopædi

Luftfugtighed

Fra Wikipedia, den frie encyklopædi

Luftfugtighed er et mål for hvor meget vanddamp luften indeholder. Lugtfugtigheden måles enten som absolut luftfugtighed eller relativ luftfugtighed. Den kan også angives som vanddampens partialtryk.

[redigér] Absolut luftfugtighed

Den absolutte luftfugtighed angiver massen af vanddamp i en given mængde luft. Den måles typisk i g/m³ (gram pr. kubikmeter).

[redigér] Relativ luftfugtighed

Den relative luftfugtighed er forholdet mellem den aktuelle mængde vanddamp i en luftmasse og den maksimale mængde vanddamp som luftmassen kan indeholde, hvilket afhænger af luftmassens temperatur og tryk. Relativ luftfugtighed udtrykkes normalt i procent med værdier fra 0 % til 100 %.

Mængden af vanddamp som luft kan indeholde, stiger ved stigende temperatur. Derfor vil en luftmasses relative fugtighed falde hvis luftens opvarmes, og tilsvarende stige hvis luften nedkøles. Ved fortsat nedkøling vil den relative luftfugtighed på et tidspunkt nå 100 %, og vanddampen vil begynde at kondensere. Der sker normalt dagligt når duggen falder om aftenen. Den temperatur som man skal nedkøle en given luftmasse til for at det sker, kaldes luftmassens dugpunkt.

Relativ luftfugtighed måles med et hygrometer.

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