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Rime (frost)
*** Shopping-Tip: Rime (frost)
Image:Rime_ice.jpg thumb|right|Rime ice, on top of [[:pl:Szczeliniec Wielki|Szczeliniec Wielki, Poland]]
Image:Windbuchencom.jpg thumb|right|Rime ice on a tree in [[Black Forest,
Germany]]
'''Rime ice''' is a white
ice that forms when the
water droplets in
fog freeze to the outer
surfaces of objects. It is often seen on
trees atop
mountains and
ridges in
winter, when low-hanging
clouds cause
freezing fog. This fog freezes to the
windward (
wind-facing) side of
tree branches,
buildings, and any other solid object.
It looks quite similar to
hoar frost, but rime ice is formed by vapour first condensing to liquid droplets (of fog, mist or cloud) and then attaching to surface, while hoar frost is formed by direct deposition from water vapour to solid ice.
Scientists at places like
Mount Washington (New Hampshire) Mount Washington in
New Hampshire often have to break huge chunks of rime ice off
weather equipment, in order to keep
anemometers and other
measuring instruments operating.
Sometimes the rime ice takes on a feathery look, and looks very much like "snow feathers".
Ice storms may consist of either
glaze ice or rime ice. Meteorologists classify transparent and homogeneous ice forming on vertical and horizontal surfaces as glaze. Glaze ice resembles ice-cube ice in appearance. Its amorphous, dense structure helps it cling tenaciously to any surface on which it forms. In contrast, if the ice is milky and crystalline, like sugar, it is termed rime. Rime ice is less dense than glaze ice and clings less tenaciously, therefore damage due to rime is generally minor compared to glaze ice.
Rime ice and glaze ice are also the two types of ice that can form on the surfaces of an aircraft, if it flies though a cloud made of supercooled water liquid droplets.
Rime ice is formed also inside of
freezers, and on objects taken out of freezers on humid days, hoar frost is formed on their surfaces in a while.
Category:water ice
de:Reif (Niederschlag)
eo:Prujno
pl:Szadź
fi:Huurre
zh:雾凇
