Is snow a solidification phenomenon or a blooming phenomenon? Please tell us about the process .

Frost and snow are both condensation of water vapor rather than solidification of liquid.

Frost is when water vapor on the surface of the ground meets a temperature below zero degrees Celsius and condenses directly into ice crystals on the ground or on blades of grass.

Snow is when the weather is colder, the atmospheric temperature is below zero degrees Celsius, and the water vapor condenses in the air into a solid state, which is a hexagonal Xiaoice crystal (or snowflake), which combines with each other to form snow flakes or snow masses when landing.

The conditions for the formation of snow are only sub-freezing, and sub-zero water vapor is generally used.

Ice crystals exist in the form of ice crystals, and most of the formation of snow is synthesized from ice crystals, and the synthesis of ice crystals belongs to condensation, so snow is formed by condensation.

Snow and frost are both condensation phenomena.

Snow: Ice crystals formed by water vapor fall to the ground.

Frost: Xiaoice crystals formed by water vapor condense on the ground or plants.

In winter, the temperature on the ground is very low. Under normal circumstances, the temperature drops by 6 degrees for every 1,000 meters above the ground, which shows that the temperature at high altitude is extremely low. Therefore, the water vapor in the high altitude does not liquefy and condenses into snow.

The precipitation in the atmosphere that falls on the earth's surface in a solid form is called atmospheric solid precipitation. Snow is one of the most widespread, prevalent, and dominant forms of atmospheric solid precipitation. Solid precipitation in the atmosphere is diverse, from beautiful snowflakes to hail, which can cause great damage, as well as snow graupel and ice particles that we don't often see.

Sublimation. Snow and rain, like rain, are formed by the cooling and condensation of water vapor in the air, but the degree of cold weather is different when condensing, so there is a difference between rain and snow. When the temperature in the upper layer of the sky is very low and the water vapor in the air condenses, it does not condense into water droplets, but directly condenses into small snow flakes from the water vapor.

This transition, in which a gas condenses into a solid without passing through a liquid, is called "condensation" in physics.

Bloom phenomenon. Ice clouds are made up of tiny ice crystals. When these Xiaoice crystals collide with each other, the surface of the ice crystals will heat up and melt somewhat, and they will stick to each other and freeze again.

This is repeated many times, and the ice crystals increase. In addition, there is also water vapor in the clouds, so the ice crystals can continue to grow by condensation. However, ice clouds are generally very high and not thick, where there is not much water vapor, and the growth of condensation is very slow, and there are not many opportunities for collisions with each other, so they cannot grow to a large size and form precipitation.

Even if precipitation is caused, it tends to evaporate on the way down and rarely reaches the ground. The most conducive to cloud growth is hybrid cloud. Hybrid clouds are made up of Xiaoice crystals and supercooled water droplets.

While a cloud of air is said to be saturated with ice crystals, it is not yet saturated with water droplets. At this time, the water vapor in the cloud condenses on the surface of the ice crystals, while the supercooled water droplets are evaporating, and the ice crystals "adsorb" water vapor from the supercooled water droplets.

In this case, the ice crystals grow quickly. In addition, supercooled water is very unstable. As soon as you touch it, it freezes.

Therefore, in a hybrid cloud, when supercooled water droplets collide with ice crystals, they freeze and stick to the surface of the ice crystals, causing them to grow rapidly. When the Xiaoice crystals grow large enough to overcome the resistance and buoyancy of the air, they fall to the ground, which is called snowflakes.

Snow melting is condensation. Snow is formed by the direct condensation of water vapor in the atmosphere or the direct solidification of water droplets, or it can be said that the temperature in the clouds is too low, and the small water droplets form ice crystals, and when they fall to the ground and are still mountain date snowflakes, it is snow. When ice melts, it traps heat, so the ground air temperature is cooler than when it snows.

Condensation is the phenomenon that a substance skips the liquid state and changes directly from a gaseous state to a solid state, and the substance is exothermic during the condensation process.

The differences between sublimation and condensation are:1. Condensation: The conditions for the formation of condensation are relatively special, which generally requires the concentration of the gas to reach a certain requirement, and the temperature to be lower than the freezing point of the decondensation.

temperature, such as water vapor below 0 degrees Celsius.

The cause of the formation is generally a sharp cooling or due to the phenomenon of sublimation.

2. Sublimation: Sublimation is the endothermic process, and the enthalpy absorbed by sublimation is called enthalpy of sublimation or heath of sublimation. The heat of sublimation of the same substance is always greater than the value of the heat of evaporation.

There are 2 possibilities – coagulation and coagulation.

When the water vapor rises, it encounters cold, and it directly condenses into ice crystals, and the cloud is called a snow cloud; And there is also a kind of historical knowledge that when the water vapor rises, it encounters cold, (of course, there is no cold mentioned above) and liquefies into small water droplets, and the clouds at this time are cumulonimbus clouds, and when the Dashi Cave reaches 1 fixed limb to dissipate the mass, (when the air can not bear it), the water droplets will fall, and if they encounter cold air in the air (of course, it also has to be 1 fixed temperature), it will solidify and form snowflakes to fall.