Hoar-frosted road marker. Crystals of hoar frost frozen onto a reflective road marker post. The red area reflects car headlights, improving road safet

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Hoar-frosted road marker. Crystals of hoar frost frozen onto a reflective road marker post. The red area reflects car headlights, improving road safety. Hoar frost forms from air that is supersaturated with water vapour. This can occur when moist air cools rapidly. For hoar frost to form, the temperature of the surface on which the deposition occurs has to be below the freezing point of water. This results in the formation of many needle-like ice crystals. Hoar frost forms in still, clear and cold weather. Photographed in Dunvegan, on the Isle of Skye, off the western coast of Scotland.

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Size: 3413px × 5139px
Photo credit: © DUNCAN SHAW/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No

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