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How Does Frost Form?
One of the hallmarks of autumn, besides leaves falling and children returning to school, is frost. Frost is the fine layer of water crystals that forms from water vapor in the air. In August, you might have felt the wet dew covering the grass in the morning. Dew forms when water vapor in the air condenses onto cool surfaces. Condensation is the name for the process of a gas changing to a liquid. If it gets cold enough at night, the water vapor goes directly from a gas to solid.This process is called deposition. The reverse process, sublimation, is when a solid changes directly to a gas.
How does frost form?Jack Frost isn’t the only one who can make frost—you can too!
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