# Why is relative humidity used instead of absolute humidity?

## Why is relative humidity used instead of absolute humidity?

Answer: Absolute humidity is the measure of water vapor (moisture) in the air, regardless of temperature. It is expressed as grams of moisture per cubic meter of air (g/m3). Relative humidity is cited in weather forecasts as it affects how we “feel” temperature.

### Do we feel relative humidity or absolute humidity?

What we “feel” as humidity in the air is the absolute humidity. Relative humidity is measured as a percentage or ratio of the amount of water vapor in a volume of air RELATIVE to a given temperature and the amount it can hold at that given temperature.

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#### Why is relative humidity not a good indicator of the actual amount of moisture in the air?

Why is relative humidity a poor indicator of the amount of water vapor in the air? Because it is temperature dependent and it is inversely proportional to air temperature. It is useful in that the dew point can be compared directly to the current temperature to determine the amount of water vapor present.

How is relative humidity different from absolute humidity and specific humidity?

Relative humidity, often expressed as a percentage, indicates a present state of absolute humidity relative to a maximum humidity given the same temperature. Specific humidity is the ratio of water vapor mass to total moist air parcel mass.

What is difference between humidity and relative humidity?

Humidity is the amount of moisture or water present in the air in the form of water vapors. It is measured in grams of water in a letter of air (mass/volume). Relative humidity is the percentage of the moisture against the highest possible level of moisture in the air at a specific temperature.

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## Why is absolute humidity not generally used?

The amount of water vapor that a parcel of air can hold is temperature dependent, thus, a given absolute humidity does not correspond to a unique relative humidity unless a temperature of the air is identified.

### How do you explain relative humidity?

Relative humidity tells us how much water vapor is in the air, compared to how much it could hold at that temperature. It is shown as a percent. For example, a relative humidity of 50 percent means the air is holding one half of the water vapor it can hold.

#### What does relative humidity indicate?

RELATIVE HUMIDITY: Relative humidity (RH) (expressed as a percent) also measures water vapor, but RELATIVE to the temperature of the air. In other words, it is a measure of the actual amount of water vapor in the air compared to the total amount of vapor that can exist in the air at its current temperature.

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