Editing Dew point (section)

==Measurement==
Devices called [[hygrometer]]s are used to measure dew point over a wide range of temperatures. These devices consist of a polished metal mirror which is cooled as air is passed over it.  The dew point is revealed by observing the loss of clarity in the reflection cast by the mirror. Manual devices of this sort can be used to calibrate other types of humidity sensors, and automatic sensors may be used in a control loop with a humidifier or dehumidifier to control the dew point of the air in a building or in a smaller space for a manufacturing process.

{| class="wikitable" style="text-align:center;"
|-
! colspan="2"|Dew point
! Relative humidity at {{convert|32|°C|°F|abbr=on}}
|-
| Over 27&nbsp;°C
| Over 80&nbsp;°F
| 73% and higher
|-
| 24–26&nbsp;°C
| 75–79&nbsp;°F
| 62–72%
|-
| 21–24&nbsp;°C
| 70–74&nbsp;°F
| 52–61%
|-
| 18–21&nbsp;°C
| 65–69&nbsp;°F
| 44–51%
|-
| 16–18&nbsp;°C
| 60–64&nbsp;°F
| 37–43%
|-
| 13–16&nbsp;°C
| 55–59&nbsp;°F
| 31–36%
|-
| 10–12&nbsp;°C
| 50–54&nbsp;°F
| 26–30%
|-
| Under 10&nbsp;°C
| Under 50&nbsp;°F
| 25% and lower
|}