![]() ![]() Likewise, to take our previous example, air at 22 and 55% RH has a dew point of 12☌. For example, at 22☌ and 100% RH the air will have a dew point of 22☌ also. ![]() Relative humidity of 100% indicates the dew point is equal to the current temperature and that the air is maximally saturated with water. A high relative humidity implies that the dew point is closer to the current air temperature. The dew point is associated with relative humidity. The dew point is the saturation temperature for water in air. Similarly if we decrease the temperature from 22☌ to 12 ☌ and kept the absolute humidity the same we would now have a relative humidity of 100% RH. So, if we increase the temperature to 30☌ but keep the absolute humidity the same (9 g/kg) the relative humidity would now be 34% RH. Further, when the moisture content remains constant and temperature increases, relative humidity decreases. For example if we have air at 22☌ and 55% we would have an absolute humidity level of 9 g/kg. 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 in the atmosphere and condensation in the factory. Relative humidity, expressed as a percent, measures the current absolute humidity relative to the maximum for that temperature (which depends on the current air temperature). If you taken an average summer day 22☌ and 55% RH you would have an absolute humidity of 9 g/kg. The hotter the air is, the more water it can contain. Absolute humidity in the atmosphere ranges from near zero to roughly 30 grams per cubic meter when the air is saturated at 30 ☌. It does not take temperature into consideration. In other words, the mass of water vapor divided by the mass of dry air in a volume of air. Relative humidity is the most common measurement, However, in order to understand relative humidity, it is helpful to first understand absolute humidity. Absolute humidity is the water content of air. ![]() Below we try to explain the different ways of measuring humidity. Humidity can be measured in several ways: either by relative humidity, absolute humidity or dew point. ![]()
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