What is the dew point or Operating Below Dew Point?

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Dew point, according to Wikipedia, refers to the amount of air that has to be cooled to achieve saturation. Dew will be formed when the temperatures are cooled to a further point. Measuring the dew point has a relationship with humidity. Having more moisture in the air will mean the dew point is high. Frost point is the time when the temperatures are below their freezing point.

At this point, frost will be made through deposition, not condensation. Measuring the dew point is connected to humidity.


The relative humidity will rise when the temperatures fall. This happens if all the other factors affecting humidity will remain the same. This is because a small amount of water vapor will be required for saturation.

In other standard conditions, dew point temperatures are not going to exceed that of air. This is because the relative humidity will not be over 100%. Practically, the dew point will be temperatures at which water vapor will condense to form liquid water, and the same rate evaporate.

When temperatures are under the dew point, condensation will be higher compared to evaporation. This means a lot of liquid water will be formed when condensation happens on a solid surface, which will be called dew. But if freezing happens, it will be frosty.

When the temperatures are under the dew point where no dew or fog is formed, that vapor will be referred to as supersaturated. It usually occurs when there are no many particles in the air. High humidity will mean that the dew point is about to reach the present air temperatures.

When relative humidity is 100%, show that the dew point is the same as the temperatures. It also means that air is well saturated with water.

How Dew Point Is Related to Human Comfort

As human beings, we tend to use the evaporation of sweat to cool down due to high temperatures. When the dew point is low, the skin tends to be dry and often irritating. People living in tropical and subtropical climates are accustomed to higher dew points.

Most people who live in cold areas will need a high dew point. At the same time, those who live in higher temperatures will find the high dew points irritating. Dew points that are low will go hand in hand with lower temperatures. This will make the body require little cooling.

Low dew points can as well go with high temperatures. But this will only happen at very low relative humidity.

Measurement of Dew Point

A Dew point is measured with an instrument called a hygrometer. This instrument has a shiny metallic mirror. As air passes over it, the mirror is cooled. The dew point will be the temperatures where dew was formed.

Physical instruments like hygrometers are used to align other humidity sensor types. In loops controlling automatic sensors is used. These are used with dehumidifiers for controlling dew points in small spaces or buildings.


Dew point is a very important factor which should be considered. Pilots and meteorologists will require this. In industrial applications, dryers can as well monitor dew points. These air dryers help in lowering dew point temperatures, thus keeping water away from air compressed systems.

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Published: 2020/12/16 - Updated: 2021/01/18
Total: 537 words

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