When frozen water vapor is deposited in the form of crystals, we call it frost. Many windows have been etched upon by “fern frost” or “ice flowers” recently, due to the cold temperatures we’ve been experiencing. When moist, heated indoor heat hits cold window glass, water vapor condenses on the glass, forming intricate patterns. The intricacy is affected by the surface of the glass, as dust and scratches affect the shape of the crystals.
Equally beautiful frost structures are created outdoors and are referred to as hoar frost. White ice crystals are deposited on exposed surfaces such as ice that are colder than the surrounding air. Often this type of surface hoar frost resembles tiny ferns that vary in size, depending upon the amount of time they’ve been forming and the amount of water vapor in the air.
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