Absolute and specific humidity are quite similar in concept.ĭew Point is the temperature at which air is saturated with water and condensation begins. Specific humidity refers to the weight of water vapor contained in a unit weight (amount) of air (expressed as grams of water vapor per kilogram of air).
Thus the relative humidity of air is a function of both water content and temperature. The relative humidity of an air-water mixture is also defined as the ratio of the partial pressure of water vapor in the mixture to the saturated vapor pressure of water at a given temperature (See what is vapor pressure). Saturated air has a relative humidity of 100%. A relative humidity of 50% means the air holds on that day (specific temperature) holds 50% of water needed for the air to be saturated. Warm air can possess more water vapor (moisture) than cold air, so with the same amount of absolute/specific humidity, air will have a higher relative humidity. Relative humidity, expressed as a percent, is a measure of the amount of water vapor that air is holding compared the the amount it can hold at a specific temperature. For example, a maximum of about 30 grams of water vapor can exist in a cubic meter volume of air with a temperature in the middle 80s. The higher the amount of water vapor, the higher the absolute humidity. There are three main measurements of humidity: relative, absolute and and specific.Ībsolute humidity (units are grams of water vapor per cubic meter volume of air) is a measure of the actual amount of water vapor in the air, regardless of the air's temperature. As the temperature of the air increases more water vapor can be held since the movement of molecules at higher temperatures prevents condensation from occurring. Water vapor is the gaseous state of water. Easily stated humidity is simply the amount of water vapor held in the air.
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