Tau

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Condensed water vapour from the atmosphere that precipitates in the form of liquid water (droplets) on cold surfaces of objects near the ground, especially in the early morning. This happens mainly in the early morning, as temperatures are lowest at this time (morning dew). The prerequisites for this are above all a clear, unclouded sky, air that is as motionless as possible and ground cover that allows good heat transfer. This is the case with lawns and leaves. When freezing of the droplets occurs, one speaks of frozen dew; when water vapour is transformed into ice, one speaks of Rauhoarfrostripeor rough ice.Dew, however, must notbe confusedwith the guttation that occurs in plants(excretion of liquid water from the interior of the plant through openings in the leaves).See also irrigation , humidity , precipitation and water.

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Tau

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