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Fig. 5.2: Maximum humidity depending on dew point | There is always a certain amount of moisture in the atmosphere. This is known as atmospheric humidity and its content varies depending on the time and place. At any temperature a certain volume of air can only contain a maximum quantity of moisture. However, atmospheric air usually contains less than this maximum amount.
Maximum humidity humax [g/m³]
Maximum humidity humax (saturation quantity ) means the maximum quantity of moisture that 1m³ air can hold at a certain temperature. The maximum humidity does not depend on pressure.
Absolute humidity hu [g/m³]
Absolute humidity hu means the actual quantity of moisture held by 1 m³ air.
Relative humidity j [%]
Relative humidity j means the ratio of absolute to maximum humidity.
j = relative humidity [%]
hu = absolute humidity [g/m³]
humax = maximale humidity [g/m³]
Since maximum humidity humax depends on the temperature the relative humidity changes with the temperature, even if the absolute humidity remains constant. On cooling to dew point, the relative humidity rises to
100 %. |