Frost is defined as a thin, delicate layer of white ice crystals that forms on solid surfaces—such as grass, leaves, window panes, and vehicles—when the ambient outdoor temperature drops below freezing (32 degrees Fahrenheit or 0 degrees Celsius). This atmospheric phenomenon occurs through a phase transition called deposition, where water vapor in the surrounding air goes directly from a gas into solid ice crystals without first turning into liquid water, typically happening during calm, clear, and cold winter or autumn nights.
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