Why do flowers freeze on the glass window in winter?

Winter is cold outside and warm inside, and the temperature difference between indoor and outdoor is very large. Water vapor in indoor air will condense into ice when it meets cold glass windows.

The condensation of water vapor needs a medium, just like the formation of raindrops and snowflakes. There is no dust in the air. Water vapor will not condense into raindrops and snow.

The glass window was covered with dust. The so-called "window" is composed of many borneol condensed in dust. If the glass is clean, there won't be flowers on it.

Extended data

1, you can't pour cold water or boiled water directly on the glass, because cold water will continue to freeze the glass; If it is boiled water, it will cause the glass to burst.

2. The surface of glass is easy to frost in winter, so it can be wiped with cloth dipped in concentrated salt water or white wine. Take two pieces of wet cloth, first wipe both sides of the glass with a wet cloth, then wipe the glass with a dry cloth dipped in a small amount of white wine, and it will be clean and bright.

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