How are rain, fog, snow, frost, dew, and hail formed? 5

Rain is formed due to a physical reaction of cold air in the upper air where water vapor rises, turning into small water droplets and then falling.

Frost is a small Xiaoice crystal formed as a result of water encountering cold air.

Conditions for the formation and classification of clouds.

In the atmosphere, the important conditions for condensation are the presence of condensation nuclei and the supersaturation of the air. For the formation of clouds, their supersaturation is mainly caused by adiabatic cooling by the vertical rise of the air. Depending on the form and scale of the upward movement, the state, height, and thickness of the clouds formed are also different.

There are four main ways in which the atmosphere moves up:

1.Thermal convection.

It refers to the upward movement of convection caused by uneven surface heating and unstable atmospheric stratification. Most of the clouds formed by convective movements are cumuliform clouds.

2.Power lift.

It refers to the large-scale upward movement of warm and moist airflow caused by the action of frontal and convergent airflow. The clouds formed by this movement are predominantly stratiform.

3.Atmospheric fluctuations.

Refers to the wave-like motion of the atmosphere over uneven ground or below the inversion layer. Clouds produced by atmospheric fluctuations are mainly undulating clouds.

4.Terrain lift.

It refers to the upward motion caused by the forced uplift of the atmosphere when it is blocked by the terrain during operation. The clouds formed by this movement include cumuliform, undulating and stratiform clouds, often referred to as topographic clouds.

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In order: liquefaction, coagulation, decoagulation (different textbooks may explain differently), condensation, liquefaction, decorating frost, snow and hail are all Xiaoice crystals formed by the direct condensation of water vapor when cold;

Fog and dew are small droplets formed by the liquefaction of water vapor.

Rime is condensation, ice is water condensation, and ice flower is water vapor condensation.

China is the earliest country in the world to record rime, and for thousands of years, the ancient people of China have had many names and praises for rime very early. As early as the Spring and Autumn Period, 770-476 BC), there are records about "tree crops" in the "Spring and Autumn Period", and some are called "Shujie", which is now called "rime".

Rime is a white or milky opaque layer of ice that adheres to the windward side of ground objects (e.g., tree branches, power lines). It is also formed by the condensation of supercooled water droplets. Rime is formed when supercooled water droplets (temperatures below freezing) collide with objects that are also below the freezing temperature.

The order is liquefaction, coagulation, condensation (different textbooks may explain differently), condensation, liquefaction, condensation.

Fog is formed by the liquefaction and exothermic of water vapor.

It is formed by the liquefaction and exothermy of rain and water vapor.

Snow and water vapor are formed by condensation and exothermy.

Frost and water vapor are formed by condensation and exothermy.

Dew vapor liquefaction and exothermic formation.

Hail water vapor condensation and exothermic formation.

Fog: Dust in the air is formed by passing through. Remember to wear a mask when it is foggy, inhaling too much is harmful to the body.

Rain: Water vapor in the air drifts to the clouds and collects into water droplets when it collects to a certain amount.

Snow: Water vapor in the air drifts to the clouds and gathers to a certain amount, and when it is collected to a certain amount, it directly condenses into ice crystals due to air pressure and low temperatures.

Frost: Similar to the formation of snow. The different one is falling from the sky. One is the water vapor from the ground.

Dew: If the water vapor on the ground does not reach 0 degrees. No condensation will be formed. Instead, it liquefies into water droplets.

The water vapor rises with the air flow, the higher the height and the lower the temperature, the water vapor will condense into liquid water droplets; If the altitude continues to increase and the temperature drops below zero degrees Celsius, the water droplets will condense into solid ice particles.

In the process of moving with the air flow, the ice particles will absorb nearby Xiaoice particles or water droplets, and gradually become larger and heavier, and when the updraft can not bear its weight, the ice particles will fall down, but the ice particles at this time are not large enough, if you can encounter a more powerful updraft, push the ice particles down and push them up, and the ice particles can continue to absorb small water droplets and condense into ice.

Under the repeated rise and fall adsorption and condensation, the ice particles will become larger and larger, and when the ice particles are big and heavy enough, and there is not enough updraft to push them up, they will fall to the ground. If it reaches the ground, it is still a solid ice particle, which is called hail, and if it melts into water and falls, it becomes rain.

1。Formation of rain. A cloud made up of liquid water droplets, including supercooled water droplets, is called a hydrogenic cloud. If the water becomes a cloud with the condition that the cloud droplet increases into a raindrop, and the raindrop has a certain rate of decline, then the rain or drizzle falls.

2。Formation of snow. Ice clouds are made up of tiny ice crystals. When these Xiaoice crystals collide with each other, the surface of the ice crystals heats up and melts somewhat, and they bond with each other and freeze again.

This is repeated many times, and the ice crystals increase. When the Xiaoice crystals grow large enough to overcome the resistance and buoyancy of the air, they fall to the ground, which is snowflakes.

3。Formation of clouds. Cloud formation is mainly caused by condensation of water vapor. Clouds floating in the sky are made up of many tiny water droplets or ice crystals, some of which are mixed together by small water droplets or Xiaoice crystals.

Sometimes it also contains large raindrops, ice and snow particles, and the base of the cloud does not touch the ground and has a certain thickness.

4。Fog formation. Whenever the visibility in the atmosphere is less than 1 km due to the condensation of suspended water vapor, meteorology calls this weather phenomenon fog.

5。Formation of dew. In summer, the ground is very hot and there is a lot of moisture. When the temperature is low before dawn, water vapor condenses into dew on leaves, flowers and plants.

6。Formation of frost. In the winter morning, the temperature on the ground is very low, and the water vapor condenses into white frost on the ground when it is cold.

7。Formation of hailstones. When the temperature is below zero degrees Celsius, there is an excess of water vapor.

Rain: Water vapor liquefies into small water droplets or ice crystals melt into small water droplets that fall to the ground to become rain and snow: Ice crystals formed by water vapor condense fall to the ground.

Clouds: small water droplets or Xiaoice crystals formed by water vapor liquefied floating in the airMist: Water vapor liquefifies into small water droplets on the groundFloats near the ground Dew: Water vapor liquefies into small water droplets on plants on the ground.

Frost: Xiaoice crystals formed by water vapor adhere to the ground or plantsHail: As the water vapor in the cloud gathers, rain can be formed, and if cold air is encountered during the rainfall, hail will be formed.