What Is Relative Humidity?
What Is Relative Humidity?
Relative humidity define the ratio of vapor density (pressure) and saturated vapor density (pressure) in the same temperature.
For example:
The maximum capacity of vapor quatity is 100 units in a certain volume at 25 ℃ . There are only 50 units vapor in the volume. The relative humidity is equal to 50%.
(50/100)*100%=50%RH
If there are 95 units vapor in the volume. The relative humidity is equal to 95%. The air is so wet that some electrical products may be demage.
(95/100)*100%=95%RH
Saturation Vapor Pressure
Temperature |
Saturation Vapor Pressure |
|||
C |
F |
mmHg |
Pa |
g/m3 |
-20 |
-4 |
0.8 |
106 |
0.84 |
-10 |
14 |
1.9 |
252 |
2.00 |
0 |
32 |
4.6 |
611 |
4.85 |
10 |
50 |
9.2 |
1,227 |
9.40 |
20 |
68 |
17.5 |
2,338 |
17.3 |
30 |
86 |
31.8 |
4,245 |
30.4 |
40 |
104 |
55.4 |
7,381 |
51.1 |
50 |
122 |
92.6 |
12,345 |
82.8 |
60 |
140 |
149.5 |
19,934 |
129.7 |
70 |
458 |
233.8 |
31,179 |
196.9 |
80 |
176 |
355.3 |
47,377 |
290.8 |
90 |
194 |
525.9 |
70,121 |
418.4 |
100 |
212 |
780.0 |
101,325 |
588.6 |
Phase Diagram of Water
Vapor Pressure of Saturated Salt In Water
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