The humidity of air at a given temperature can be given as the water content or the relative humidity.
The water content of air is measured with a hygrometer and is reported in mg/L.
relative humidity at °C =
= (measured water content in mg/L at °C) / (absolute humidity at °C when saturated) * 100%
|
Temperature in °C |
Absolute Humidity in mg/L Air When Saturated |
Water Vapor Pressure in mm Hg at Saturation |
|
19 |
16.3 |
16.5 |
|
20 |
17.3 |
17.5 |
|
21 |
18.4 |
18.6 |
|
22 |
19.4 |
19.8 |
|
23 |
20.6 |
21.0 |
|
24 |
21.8 |
22.3 |
|
25 |
23.0 |
23.7 |
|
26 |
24.4 |
25.1 |
|
27 |
25.8 |
26.7 |
|
28 |
27.2 |
28.3 |
|
29 |
28.8 |
29.9 |
|
30 |
30.4 |
31.7 |
|
31 |
32.0 |
33.6 |
|
32 |
33.8 |
35.5 |
|
33 |
35.6 |
37.6 |
|
34 |
37.6 |
39.8 |
|
35 |
39.6 |
42.0 |
|
36 |
41.7 |
44.4 |
|
37 |
43.9 |
46.9 |
|
38 |
46.2 |
49.5 |
|
39 |
48.6 |
52.3 |
|
40 |
51.1 |
55.1 |
|
41 |
53.7 |
58.1 |
If the data in the first 2 columns is analyzed with JMP:
absolute humidity of air when saturated at a given temperature =
= (0.03838 * ((temperature in °C)^2)) - (0.62339 * (temperature in °C)) + 14.521
water vapor pressure of air when saturated at a given temperature =
= (0.046067 * ((temperature in °C)^2)) - (0.8969 * (temperature in °C)) + 17.155455
