How are natural phenomena such as snow and frost, rain, snow, dew, frost, wind, and ice formed?

Rain, liquefaction. Frost, condensation.

Snow, condensation. Cloud, gasification.

Hail mostly comes from cumulonimbus clouds with strong convection. The diameter of hail is generally in the range of 5-50 mm, and the large ones can reach a few centimeters to tens of centimeters. It is conceivable that even small hailstones can exist in clouds, but strong updrafts are required.

According to statistics, the speed of the rising motion must be greater than 20 meters per second when hail, and the rising speed of more than 20 meters seconds is required to produce a large hail with a diameter of 10 centimeters. Therefore, hail is generally possible only when the cloud top develops near the tropopause. Hail is not generated immediately when the air flow rises above 0 height, and dissecting hail reveals an opaque core.

The exterior is surrounded by alternate layers of transparent and opaque ice. So the hail looks white from a distance and is not as transparent as the ice. Why is hail such a structure?

This is determined by the process of hail formation. Because the temperature in the cumulonimbus cloud is below the height of 0 water droplets, the above are supercooled water droplets, ice crystals, snowflakes, when the supercooled water droplets rise with the updraft, they freeze with the ice crystals or snowflakes to form the core of hail. Because the freezing time is very short and the freezing speed is very fast, the formed hail nucleus is mixed with air, and the tissue is relatively loose, forming an opaque white ice layer, and the faster it freezes, the whiter and more opaque the frozen ice layer is.

When the temperature is higher below 0 altitude, the ice on the surface of the hail core melts into water, and at the same time, it will collide with some raindrops during the descent process, and some water sticks to the outside. When the hail core is covered with water outside, it encounters a strong updraft and is once again brought above layer 0. At this time, the water outside the hail core freezes into ice again, and at this time, it gradually freezes, so it becomes a transparent ice layer.

When the hail encounters cold water droplets again, it condenses on it and collides with ice crystals and snowflakes to form an opaque ice layer, and the hail increases in volume and descends, and so on many times, it may form a large hailstone.

Water vapor! Depending on the degree of coldness, the state of the presentation is also different!

Is it the cause of snow and frost?

Lu: The temperature drops in the group hall at night, and the water vapor near the ground hits the surface object.

Frost: A solid substance in which water vapor exothermic condenses branches.

Snow: One: Ninghua. 2: Liquid bloom first, then solidify.

Rain: The water vapor evaporates into clouds, and then the water vapor is transported, the clouds cannot withstand the hidden force of heavy collapse, and small water droplets fall into rain.

Fog: Warm air currents in the air liquefy near the ground when cold.

I'm also a junior high school student, so I'd like to adopt it.

Clouds: Water vaporization (evaporation) Then liquefaction rain at a lower temperature at high air: small water droplets liquefied at high altitude merge into larger droplets, and when gravity is strong enough, it changes and falls to form rain.

Snow: Water vapor condenses directly in the air.

Dew: Cooler temperatures in the early morning liquefy water vapor.

Fog: Water vapor is formed by liquefaction with the help of solid dust particles.

Frost: Low-altitude condensation.

Frost formation: In the morning of winter, the temperature on the ground is particularly low, and the water vapor near the ground is condensed into small Xiaoice crystals attached to the ground or plants, which is frost.

Snow formation: In winter, the altitude is colder, and the water vapor is cooled sharply and cooled, directly condensing into hexagonal Xiaoice crystals - snowflakes, when the snowflakes fall, they combine with each other, from small to large into snow flakes or large snowflakes, at this time, it will snow with goose feathers.

Because the formation is different ...

One is formed at high altitude and one at the surface.

Conditions for the formation of snow:

The water vapor is saturated and there are contrail nuclei in the air.

Formation of frost. The temperature of the surface of the object is very low, and the air temperature near the surface of the object is relatively high, then there is a temperature difference between the air and the surface of the object, if the temperature difference between the surface of the object and the air is mainly caused by the radiative cooling of the surface of the object, then the air will cool when the warmer air and the colder surface of the object come into contact, and the excess water vapor will precipitate when the water vapor is supersaturated. If the temperature is below 0°C, the excess water vapor condenses into ice crystals on the surface of the object, which is called frost.

Therefore, frost always forms in weather conditions that favor radiative cooling of the surface of the object.

The formation of frost is related not only to the above-mentioned weather conditions, but also to the properties of ground objects. Frost is formed on the surface of an object that is radially cooled, so the more easily the surface of the object radiates heat and cools quickly, the easier it is to form frost on it. Under the same conditions, if the mass of the same object is the same, the amount of heat contained in it is also the same.

If they radiate heat at the same time during the night, then at the same time, objects with a larger surface area dissipate more heat and cool faster, and frost is more likely to form on it. That is, an object that has a relatively large surface area in relation to its mass is prone to frost formation on it. The blades of grass are very light, but the surface area is large, so the blades of grass are prone to frost.

In addition, a rough surface of an object is more conducive to radiation heat dissipation than a smooth surface, so frost is more likely to form on objects with a rough surface, such as clods.