Dew point
The dew point is related to the vapor pressure of the liquids. It is defined as the temperature point at which the saturation vapor pressure (maximum pressure by the vapors at a given temperature) equals the present vapor pressure.
The temperature below the dew point temperature causes the vapors to reach the condensation state. It means that below the dew point, the vapor condenses, and the rate of condensation becomes greater than that of the evaporation. The condensation water, when it freezes, is known as frost, while on solid surface is known as dew. In the air, the condensation water is often known as cloud and fog.
Let’s consider an example of water vapors.
We know that water vapor is the gaseous form of water that contains water droplets. At the dew point, the air cannot hold more water in its gaseous state. We can also say that air is heavy and has no space for water droplets to fit into it. The higher the dew point, the more moisture the air would contain, which means the air’s humidity increases.
Dew point range in the atmosphere
The atmosphere at different dew points is listed in the below table:
| Dew point range | Atmosphere condition |
|---|---|
| Dew point < 55 | Dry and comfortable |
| 55 < dew point < 65 | Sticky |
| Dew point > 65 | Heavy humid |
Humidity percentage at different temperatures
The device used to measure the dew point temperature is a hygrometer. It is commonly known to measure water vapors or the moisture in the air and other places. The dew point of the air can also be controlled using a combination of sensors, a humidifier, and a dehumidifier. The humidifier is used to add moisture to the air when the air is dry, and the dehumidifier is used to remove the moisture from the air.
The table shows the humidity percentage at a different temperature range in Celsius as well as Fahrenheit.
| Dew point temperature | Relative humidity | |
|---|---|---|