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science.howstuffworks.com/nature/climate-weather/atmospheric/question651.htm

Relative humidity is the ratio of the current absolute humidity to the highest possible absolute humidity (which depends on the current air temperature). A reading of 100 percent relative humidity means that the air is totally saturated with water vapor and cannot hold any more, creating the possibility of rain.

en.wikipedia.org/wiki/Relative_humidity

Relative humidity (RH) is the ratio of the partial pressure of water vapor to the equilibrium vapor pressure of water at a given temperature. Relative humidity depends on temperature and the pressure of the system of interest. The same amount of water vapor results in higher relative humidity in cool air than warm air.

sciencing.com/explain-relative-humidity-children-8426689.html

Relative humidity is the quantity of moisture in the air divided by the quantity of moisture that would saturate the air. However, this definition might be too complex for children to comprehend. After defining the concept to the children, explain to them how to calculate relative humidity in easy-to-understand steps.

sciencing.com/temperature-ampamp-humidity-related-7245642.html

Temperature and humidity affect the Earth's weather and the health and comfort of its residents. Relative humidity describes the percentage of water vapor in air that changes as air temperature changes. Dew point refers to the temperature at which air reaches saturation by water molecules.

www.livescience.com/43269-what-is-dew-point.html

The relative humidity is 100 percent when the dew point and the temperature are the same. If the temperature drops any further, condensation will result, and liquid water will begin to form.

en.wikipedia.org/wiki/Humidity

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. In hot summer weather, a rise in relative humidity increases the apparent temperature to humans (and other animals) by hindering the evaporation of perspiration from the skin.

www.quora.com/What-is-the-relationship-between-temperature-and-humidity

Relative humidity is a ratio of actual amount of water vapour (content) in the air compared to the maximum water vapour the air is able to hold (capacity) at that temperature. It is expressed as percentage. Relative humidity does not tell how much...

www.britannica.com/.../Relation-between-temperature-and-humidity

Climate - Climate - Relation between temperature and humidity: Tables that show the effect of temperature upon the saturation mixing ratio rw are readily available. Humidity of the air at saturation is expressed more commonly, however, as vapour pressure. Thus, it is necessary to understand vapour pressure and in particular the gaseous nature of water vapour. The pressure of the water vapour ...

www.weather.gov/arx/why_dewpoint_vs_humidity

For example, a temperature of 30 and a dew point of 30 will give you a relative humidity of 100%, but a temperature of 80 and a dew point of 60 produces a relative humidity of 50%. It would feel much more "humid" on the 80 degree day with 50% relative humidity than on the 30 degree day with a 100% relative humidity.