Step 1 : Introduction to the question "What is hoar?"
Hoar frost (also hoarfrost, radiation frost, or pruina) refers to white ice crystals deposited on the ground or loosely attached to exposed objects, such as wires or leaves. They form on cold, clear nights when conditions are such that heat radiates out to the open air faster than it can be replaced from nearby sources, such as wind or warm objects. Under suitable circumstances, objects cool to below the frost point of the surrounding air, well below the freezing point of water. Such freezing may be promoted by effects such as flood frost or frost pocket. These occur when ground-level radiation loses cool air until it flows downhill and accumulates in pockets of very cold air in valleys and hollows. Hoar frost may freeze in such low-lying cold air even when the air temperature a few feet above ground is well above freezing.
Step 2 : Answer to the question "What is hoar?"
A type of grayish-white frost resembling lace:
Description: Hoar frost is also known as pruina or radiation frost. It consists of interlocking white ice crystals loosely deposited over the ground or exposed objects. Hoar frost occurs on especially cold nights when radiant heat dissipates, causing objects to become colder than the air around them. Many consider it frozen dew, but that's an incorrect characterization. Hoar frost actually results from direct sublimation of water vapor that eventually becomes ice crystals. Source: Infomory.com
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