KANOMAX 2211 Handheld IAQ Monitor - Manual (Page 52)

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10.4 What is HR
Humidity Mixture Ratio -- -HR
Humidity Ratio (mixture ratio) is the proportion of masses between water vapor and dry air.
Temperature and relative humidity are used on below formula.
Society of Heating, Air-conditioning and
Sanitary Engineers of Japan
ｒ＝ε×e/(p-e) ×1000
ε: Molar mass ratio = 0.62198
e: Water vapor （Pa）
p: Barometric pressure (Pa)
r: Humidity ratio (g/kg)
Reference:
“Understanding Aero-diagram” by Society of Heating,
Air-conditioning and Sanitary Engineers of Japan
“Humidity and Vaporization” by Masafumi Ueda