Humidity
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| + | [[File:Cloud forest mount kinabalu.jpg|thumb|right|Tropical forests and high-altitude regions often have high humidity.]] | ||
| + | '''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'''. | ||
| - | '''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: | + | ==See also== |
| + | *[[Relative humidity]] | ||
| + | *[[Savory brittleness scale]] | ||
| + | *[[Concentration]] | ||
| + | *[[Dew point]] | ||
| + | **[[Dew point depression]] | ||
| + | *[[Humidity indicator]] | ||
| + | *[[Hygrometer]] | ||
| + | **[[Psychrometrics]] | ||
| - | *Epinasty: downward-bending from growth at the top, for example, the bending down of a heavy flower. | ||
| - | *Photonasty: response to light | ||
| - | *[[Nyctinasty]]: movements at night or in the dark | ||
| - | *Chemonasty: response to chemicals or nutrients | ||
| - | *Hydronasty: response to water | ||
| - | *Thermonasty: response to temperature | ||
| - | *Geonasty/gravinasty: response to gravity | ||
| - | *[[Thigmonasty]]/seismonasty/haptonasty: response to contact | ||
| - | |||
| - | Also see [[taxis]], [[kinesis (biology)|kinesis]] and [[tropism]] for other types of movement. | ||
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thumb|right|Tropical forests and high-altitude regions often have high humidity. 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.
See also
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