Concept explainers
Dewpoint. The dewpoint is the temperature at which moisture in the air condenses into liquid (dew). It is a function of air temperature t and relative humidity h. The table below shows the dewpoints for select values of t and h.
Air Temperature,
|
Relative Humidity (%) | ||||
20 | 40 | 60 | 80 | 100 | |
70 | 29 | 44 | 55 | 63 | 70 |
80 | 35 | 53 | 65 | 73 | 80 |
90 | 43 | 62 | 74 | 83 | 90 |
100 | 52 | 71 | 84 | 93 | 100 |
a. What is the dewpoint when the air temperature is 80°F with a relative humidity of 60%?
b. What is the dewpoint when the air temperature is 90°F with a relative humidity of 40%?
The air feels humid when the dewpoint reaches about 60. If the air temperature is 100°F at what approximate relative humidity will the air feel humid?
Explain why the dewpoint is equal to the air temperature when the relative humidity is 100%.
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