frost - National Geographic Society
https://www.nationalgeographic.org/encyclopedia/frost/
WEBOct 19, 2023 · Frost is water vapor, or water in gas form, that becomes solid. Frost usually forms on objects like cars, windows, and plants that are outside in air that is saturated, or filled, with moisture. Areas that have a lot of fog often have heavy frosts. Frost forms when an outside surface cools past the dew point.
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