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# What Is Dew Point in Physics - Definition, Dew Point vs Humidity, and Formula to Calculate Dew Point!

What is Dew Point in physics: People often confuse dew point with humidity and in this article know what is dew point in physics is, its characteristics, learn the difference between Dew point and Humidity. Also learn the formula to calculate the Dew point, which helps in forecasting weather.

by Isaimozhi K | Updated Sep 15, 2021 13:22 PM

## What Is Dew Point in Physics?

The dew point is the temperature at which water vapor, the gaseous state of water, is saturated in the air. When air reaches dew point temperature at a given pressure, water vapor in the air is in equilibrium with liquid water, which means water vapor condenses at the same rate as liquid water evaporates. Liquid water will begin to condense on surfaces below the dew point.

## Define dew point in physics

How would you define dew point? It is pretty simple. The dew point is defined as the temperature to which air must be cooled to become saturated with water vapor. It is assumed that air pressure and water content are constant. A higher Dew point means that there is more moisture in the air.

## Dew Point vs Humidity- What is the difference?

Dew point is similar to Humidity in terms of general meaning. Humidity is the percentage of moisture present in the air. Humidity is expressed in terms of percentage, which is commonly called Relative Humidity. In simple words, A Dewpoint is the quantity of moisture in the air while relative humidity is related to how close the air is to saturation.

For example, if Relative humidity is 50%, which indicates that the air can only hold half of the water it can hold. It is holding the utmost amount of water possible if the relative humidity is 100 percent. When this happens, clouds may form, and rain might fall. The dew point temperature is the temperature of the air when this happens, and it's an important aspect of humidity.

## Dew Point Calculation

The “hygrometer” is a device that is used to calculate the Dew point temperature manually. It works by cooling a smooth, shining surface, such as a mirror until water vapor in the air condenses on it. You will get the dew point temperature when this happens. We can also find this by comparing the temperature with the dew point. To find the humidity of the air use a formula to find the Relative Humidity which is given below,

Relative Humidity = Mixing Ratio∕Saturation Mixing Ratio × 100

Where Mixing Ratio - Amount of water vapor in the air,

Saturation Mixing Ratio - Amount of water vapor when it is saturated (the maximum amount of water vapor it can hold).

The Dew point indicates to us the weather for the day. If you find the dew point higher, it indicates severe weather, such as storms, rain, etc. So, finding the dew point helps people to forecast weather easily. Follow this space for more such content!

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## What is dew point in physics - FAQs

1. What is the dew point in physics?

The dew point is the temperature at which water vapor, the gaseous state of water, is saturated in the air.

2. What is the difference between a dew point and humidity?

Dewpoint is related to the quantity of moisture in the air while relative humidity is related to how close the air is to saturation.

3. What are a comfortable dew point and humidity?

The dew points in the 50s or lower are comfortable during the warm months.

4. What dew point indicates the highest humidity?

The dewpoint of 60 - 63°F begins to “feel” more humid.

5. What is the highest dew point noticed in the world?

The highest dew point ever recorded was in the United States - 90°F (32°C) in New Orleans Naval Air Station, on July 30, 1987, and in Melbourne, Florida on July 12, 1987.

6. Which dew point causes rain?

If there is a 60-degree dew point and the air temperature is 60, however, it might rain.

7. What is the lowest dew point possible?

The world's lowest recorded relative humidity value was at Coober Pedy in the South Australia desert. The temperature was 93 degrees and the dew point was minus 21 degrees producing a relative humidity of 1 percent.