What is frost? What is frost?

Frost (1) is a common agrometeorological disaster, which means that the temperature drops suddenly and the surface temperature drops below 0℃, causing damage to crops and even death. Frost usually appears in autumn, winter and spring. It is different from frost. "Frost" is a white ice crystal that condenses directly on objects when the water vapor in the air near the ground reaches saturation and the ground temperature is lower than 0℃. When there is frost, it is not necessarily frost. There may not be frost in first frost, and there may not be frost in first frost.

2. The solar terms "first frost", "first 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.