How does frost form?

Irina Belova
Irina Belova
September 19, 2014
How does frost form?

Frost - one of the most beautiful natural phenomena. About what he is, we told in the article What is frost. Here we will talk about when and how frost is formed.

Frost is formed as a result of two successive processes - condensation of water vapor and crystallization of the resulting water droplets. For this, it is necessary that the relatively warm weather be replaced by a sudden cold - because the water turns into ice at zero temperature. Therefore, the best time for the formation of "winter dew" is late autumn, winter and early spring, when there is almost no wind, and sunny days alternate with cold clear nights.

Warm, heated by the day sun, the air contains an excessive amount of moisture. At night, the air cools down, and the vapor settles on cold surfaces, turning into the smallest ice crystals. At small frosts, frost crystals have a hexagonal shape. When the frost grows stronger, they resemble the thinnest plates, and with a very sharp cooling, they become like snow needles.

Frost "likes" to form on rough surfaces with low thermal conductivity. In nature, it is land, ice cover on rivers and reservoirs, fallen trees and fallen leaves. In the city of frost can be seen on the sidewalks, benches and roofs of cars. The frosty patterns appearing on the window panes due to the temperature difference inside and outside the house are also frost. In the same way, water droplets from warm air settle to the walls of your freezer when you open the door.

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