What is the physical phenomenon of frosting?

Frosting is a phenomenon of sublimation.

Frost usually appears in the morning, when the water vapor on the surface meets the temperature below degrees Celsius, it becomes solid directly. The conditions for the formation of condensation are quite special. Generally, the concentration of gas is required to reach a certain requirement, and the temperature is lower than the freezing point, such as water vapor below degrees Celsius. The reason for the formation is generally a sharp drop in temperature or sublimation.

Introduction

Scientifically, frost is composed of ice crystals, and the appearance process of dew is the same, which is the phenomenon that water is separated from the air when the relative humidity in the air reaches 1%. The only difference between them is that the dew point (the temperature at which water vapor liquefies into dew) is higher than the freezing point, while the frost point (the temperature at which water vapor condenses into frost) is lower than the freezing point, so frost will only occur when the near-surface temperature is lower than ℃.

Frost is not the same as Frost and first frost, they are three different concepts. "Frost" refers to a kind of white ice crystal formed by condensation of water vapor on the ground in cold weather; "Frost" refers to a common phenomenon of agrometeorological disasters; The "first frost" solar term refers to the season that reflects the sudden drop of temperature, while the "first frost" does not mean "frosting", but rather cold weather.