What is frost?

Frost is made up of ice crystals, similar to dew. When the relative humidity in the air reaches 100%, water is separated from the air.

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 appear when the near-surface temperature is lower than 0℃. Frost, frost and first frost are not the same thing, but three different concepts.

"Frost" refers to a white ice crystal formed by condensation of water vapor on the ground in cold weather; "Frost" refers to a common agricultural meteorological disaster phenomenon; 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 refers to the cold weather.

Extended data:

The harm of frost to crops, etc. According to its characteristics, the following defensive countermeasures should be taken in areas with more frost disasters:

1. Arrange planting plans according to different topography and soil quality, and arrange varieties with strong frost resistance in places prone to frost. The farmer's proverb "Frost hits the snow and sinks" shows that frost is prone to occur in low-lying areas and is serious. The more occluded the terrain, the greater the frost damage.

2. Taking comprehensive cultivation measures to reduce frost disaster and watering algae wheat fields is the most ideal frost prevention method at present. Because watering can not only slow down the temperature, but also promote the growth of wheat and enhance the cold resistance. According to the weather forecast, temporary smoking, field spraying or blast can also achieve the purpose of frost prevention.