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Humans are sensitive to humidity, as the [[skin]] relies on the air to evaporate moisture. The process of sweating is the body's attempt to keep cool and maintain its current temperature. If the air is at 100% relative humidity, sweat will not evaporate into the air. As a result, we feel much hotter than the actual temperature when the relative humidity is high. If the relative humidity is low, we can feel much cooler than the actual temperature because our sweat evaporates easily, cooling us off. For example, if the air temperature is 75 degrees [[Fahrenheit]] (24 degrees [[Celsius]]) and the relative humidity is zero percent, the air temperature feels like 69 degrees Fahrenheit (21 C) to our bodies. If the air temperature is 75 degrees Fahrenheit (24 C) and the relative humidity is 100 percent, it feels like it's 80 degrees (27 C) out. Humans are normally most comfortable at about 40% humidity.<ref>[http://www.usatoday.com/weather/whumdef.htm Understanding Humidity, article, USA Today]</ref>
Humans are sensitive to humidity, as the [[skin]] relies on the air to evaporate moisture. The process of sweating is the body's attempt to keep cool and maintain its current temperature. If the air is at 100% relative humidity, sweat will not evaporate into the air. As a result, we feel much hotter than the actual temperature when the relative humidity is high. If the relative humidity is low, we can feel much cooler than the actual temperature because our sweat evaporates easily, cooling us off. For example, if the air temperature is 75 degrees [[Fahrenheit]] (24 degrees [[Celsius]]) and the relative humidity is zero percent, the air temperature feels like 69 degrees Fahrenheit (21 C) to our bodies. If the air temperature is 75 degrees Fahrenheit (24 C) and the relative humidity is 100 percent, it feels like it's 80 degrees (27 C) out. Humans are normally most comfortable at about 40% humidity.<ref>[http://www.usatoday.com/weather/whumdef.htm Understanding Humidity, article, USA Today]</ref>
==See Also==
==See also==
* [[Water]]
* [[Water]]
* [[Rainfall]]
* [[Rainfall]]