Humidity  

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-'''Nastic movements''' are non-directional [[Stimulus (psychology)|responses]] to [[stimulus (physiology)|stimuli]] (e.g. [[temperature]], [[humidity]], light [[irradiance]]). The movement can be due to changes in [[turgor]] or changes in growth. Nastic movements differ from [[Tropism|tropic movements]] in that the direction of tropic responses depends on the direction of the stimulus, whereas the direction of nastic movements is independent of the stimulus' position. The rate or [[frequency]] of these responses increases as intensity of the stimulus increases. An example of such a response is the opening and closing of flowers (photonastic response). Nastic responses are usually associated with [[plants]]. They are named with the suffix "-nasty" and have prefixes that depend on the stimuli:+'''Humidity''' is a term for the amount of [[water vapor]] in the [[air]], and can refer to any one of several measurements of humidity. Formally, humid air is not "moist air" but a mixture of water vapor and other constituents of air, and humidity is defined in terms of the water content of this mixture, called the '''absolute humidity'''.
-*Epinasty: downward-bending from growth at the top, for example, the bending down of a heavy flower.+==See also==
-*Photonasty: response to light+*[[Relative humidity]]
-*[[Nyctinasty]]: movements at night or in the dark+*[[Savory brittleness scale]]
-*Chemonasty: response to chemicals or nutrients+*[[Concentration]]
-*Hydronasty: response to water+*[[Dew point]]
-*Thermonasty: response to temperature+**[[Dew point depression]]
-*Geonasty/gravinasty: response to gravity+*[[Humidity indicator]]
-*[[Thigmonasty]]/seismonasty/haptonasty: response to contact+*[[Hygrometer]]
 +**[[Psychrometrics]]
-Also see [[taxis]], [[kinesis (biology)|kinesis]] and [[tropism]] for other types of movement. 
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Humidity is a term for the amount of water vapor in the air, and can refer to any one of several measurements of humidity. Formally, humid air is not "moist air" but a mixture of water vapor and other constituents of air, and humidity is defined in terms of the water content of this mixture, called the absolute humidity.

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