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Condensed water vapour from the atmosphere that condenses in the form of liquid water (droplets) on cold surfaces of objects close to the ground. This occurs mainly in the early morning when temperatures are at their lowest (morning dew). The prerequisites are a clear, unclouded sky, air that is as still as possible and ground cover that enables good heat transfer. This is the case with lawns and leaves.

Tau - Blatt mit Tropfen und Tautropfen

If the droplets freeze, this is referred to as frozen dew, while the conversion of water vapour to ice is referred to as hoar frost or rime, but dew should not be confused with the guttation that occurs in plants (excretion of liquid water from the inside of the plant through openings in the leaves). See also irrigation, humidity, precipitation and wind.

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