17 Facts About Relative humidity

Three primary measurements of humidity are widely employed: absolute, relative, and specific.

Absolute Relative humidity is expressed as either mass of water vapor per volume of moist air or as mass of water vapor per mass of dry air (usually in grams per kilogram).

Relative humidity, often expressed as a percentage, indicates a present state of absolute humidity relative to a maximum humidity given the same temperature.

Specific Relative humidity is the ratio of water vapor mass to total moist air parcel mass.

Absolute Relative humidity is the total mass of water vapor present in a given volume or mass of air.

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Absolute Relative humidity is the mass of the water vapor, divided by the volume of the air and water vapor mixture, which can be expressed as:.

In other words, relative humidity is the ratio of how much water vapour is in the air and how much water vapour the air could potentially contain at a given temperature.

Relative humidity is normally expressed as a percentage; a higher percentage means that the air–water mixture is more humid.

Relative humidity is an important metric used in weather forecasts and reports, as it is an indicator of the likelihood of precipitation, dew, or fog.

Specific Relative humidity is the ratio of the mass of water vapor to the total mass of the air parcel.

Specific Relative humidity is approximately equal to the mixing ratio, which is defined as the ratio of the mass of water vapor in an air parcel to the mass of dry air for the same parcel.

Therefore, a change in relative humidity can be explained by a change in system temperature, a change in the volume of the system, or change in both of these system properties.

In cooler places such as Northern Tasmania, Australia, high Relative humidity is experienced all year due to the ocean between mainland Australia and Tasmania.

Also, if the atmosphere is as warm or warmer than the skin during times of high Relative humidity, blood brought to the body surface cannot dissipate heat by conduction to the air.

The low Relative humidity is a consequence of drawing in the very cold air with a low absolute Relative humidity, which is found at airliner cruising altitudes.

Relative humidity is often mentioned in weather forecasts and reports, as it is an indicator of the likelihood of dew, or fog.

Device used to measure Relative humidity is called a hygrometer; one used to regulate it is called a humidistat, or sometimes hygrostat.