Feature #420
bme680: calculate absolute humidity
0%
Beschreibung
https://www.omnicalculator.com/physics/absolute-humidity
https://rechneronline.de/barometer/luftfeuchtigkeit.php
27°C; 54% -> 13.9038g/m³
Taupunkt: 16,9
This works: https://www.wetterochs.de/wetter/feuchte.html10^5 * mw/R* * SDD/TK = 10^5 * 18,016/8314,3 * 6.1078 * 10^((7,5*T)/(237.3+T))/(T + 273,15)
R* = 8314.3 J/(kmol*K) (universelle Gaskonstante)
mw = 18.016 kg/kmol (Molekulargewicht des Wasserdampfes)
TK = Temperatur in Kelvin (TK = T + 273.15)
SDD = 6.1078 * 10^((a*T)/(b+T))
DD = r/100 * SDD
a = 7,5
b = 237,3
AF = 10^5 * mw/R* * DD/TK
= 10^5 * 18,016 / 8314,3 * r / 100 * ( 6.1078 * 10^( ( 7,5 * T ) / ( 237,3 + T ) ) ) / ( T + 273,15 )
= 10^5 * 18,016 / 8314,3 * 54 / 100 * ( 6,1078 * 10^( ( 7,5 * 27 ) / ( 237,3 + 27 ) ) ) / ( 27 + 273,15 )