"relative humidity." YourDictionary, n.d. Web. 05 December 2018. <https://www.yourdictionary.com/relative-humidity>.
relative humidity. (n.d.). Retrieved December 05th, 2018, from https://www.yourdictionary.com/relative-humidity
The ratio of the actual amount of water vapor present in a volume of air at a given temperature to the maximum amount that the air could hold at that temperature, expressed as a percentage. Warm air can hold more water vapor than cool air, so a particular amount of water vapor will yield a lower relative humidity in warm air than it does in cool air.