Frosted Reeds, Loch of Skene, Aberdeenshire. Grampian. Scotland. XPL 4361-411
Hoar frost (sometimes hoarfrost) refers to the white ice crystals, deposited on the ground or exposed objects, that form when the air is moist and surface is cold. Hoar frost is often seen on cold, clear autumn nights. Hoar frost does not occur exclusively in nature. Hoar frost is also found in and around freezers particularly in industrial cold storage facilities. It occurs in adjacent rooms that are not well insulated against the cold and around entry locations where humidity and moisture will enter and freeze instantly depending on the freezer temperature. Hoar frost is similar in appearance to rime ice, but the two are distinct. In formation of hoar frost, the water vapour condenses through deposition directly to solid ice whereas rime ice is formed following initial condensation into liquid droplets. Thus, hoar frost is formed when the dew point is warmer than surface but colder than the air temperature, and colder than freezing point. The formation of frost is an example of meteorological deposition. Hoar Frost is a common cause of avalanches when it forms at the snow's surface and subsequent layers of snow fall on top of it. The layer of hoar frost consists of angular crystals that do not bond well to each other or other layers of snow, causing upper layers to slide off under the right conditions, especially when upper layers are well bonded within themselves, as is the case in a slab avalanche. Many plants can be damaged or killed by freezing temperatures, and by frost. This will vary with the type of plant and tissue exposed to low temperatures. Plants considered to be tender, such as tomatoes, will die immediately if they are exposed to frost. Hardy plants such as radish will tolerate lower temperatures. Perennials, such as the hosta plant, will die back after first frosts and regrow when spring arrives. The entire visible plant may completely turn brown until the spring warmth, or will drop all of its leaves and flowers, leaving the stem and stalk only. E
Size: 3573px × 5380px
Location: Loch of Skene, Dunecht, Aberdeenshire Grampian Region. Scotland.
Photo credit: © David Gowans / Alamy / Afripics
License: Licensed
Model Released: No
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