Frost forms when the air is cold and moist, and a surface is below freezing! Think of it like tiny ice crystals decorating everything.
Here's a simple breakdown:
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Water Vapor in the Air: The air always has tiny bits of water in it, called water vapor. You can't see it!
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Cold, Cold Surfaces: When something like grass, a car window, or a leaf gets very cold (below 32°F or 0°C), it's ready for frost.
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Freezing Time: The water vapor in the air that touches the freezing-cold surface turns directly into ice crystals (frost)! It skips being liquid water first. This is called deposition.
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Like Tiny Ice Decorations: All those tiny ice crystals clump together and make the pretty patterns of frost that you see.
So, in simple terms, frost is frozen water vapor that sticks to cold surfaces on chilly mornings!
