Oak trees in winter. These sessile oak trees (Quercus petraea) are covered in hoar frost. Sessile oak trees are found throughout western Europe and parts of Asia,and can grow up to 45 metres tall. Hoar frost forms in a similar way to dew,in that water is deposited from air that is supersaturated with water vapour. This can occur when moist air cools rapidly. The difference is that the temperature of the deposition surface is below the freezing point of water,and ice crystals form. Hoar frost forms in still,clear and cold weather. Photographed in the UK | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Booth, Simon |
Bildgröße: | 5125 px × 3412 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |