The essence of clouds is water, so why can water float in the air?

Introduction: In fact, the clouds that people observe in their daily lives are not like marshmallows.

It's the same thing, but it's made up of water, but in everyday life, people feel that water is heavier than air. So why is it that clouds can float in the air, but the water in lakes can't be eliminated in the air?

In fact, air is also dense, and air is a mixture of various gases, for example, air contains oxygen and carbon dioxide.

It also contains some noble gases.

Therefore, the air also has a certain density. The concept of floating in people's daily lives does not require a special substance, it only needs to be able to float at a lower average density than another. For example, although clouds are essentially water, this is not water like rivers and lakes, but water vapor.

Taken together, the average density of the clouds formed by this water is lower than that of the air, so the air provides a certain amount of buoyancy. In this case, the clouds can float in the air, and the water can float in the air. The fact that a ship is also very heavy and can still float in the water is also related to the average density.

Therefore, as long as the buoyancy is greater than its own gravity, then it is fine, and people have also used this principle to build airboats.

In fact, the most important thing for human beings is to maintain the body temperature of the surface and the role of rainfall, although there is water in the clouds, but when this water becomes rain requires specific conditions. In general, with the change of seasons and the alternation of hot and cold air, large-scale precipitation will occur, and the climate change will vary from region to region. But beware, with global warming.

As well as the emergence of various weather, places that were not prone to precipitation before have more precipitation. This also shows that there are some anomalies in the location of the warm current and the cold air, as well as the confluence location, so it is important to pay attention to the change in climate.

Because the pressure in the sky is relatively large, the water will exist in the air in other ways, and when it cools, the water will change in solidity, so it will fall.

Because clouds are made up of small water droplets, they have a very low density, so they float in the air.

Because clouds are less dense than air, they can float into the air.

1: The flow of the empty section of acacia gas and the size of the water droplets. The air flow can be both horizontal and vertical.

The horizontal direction causes the clouds to move horizontally, and the vertical upward air movement pushes the clouds high into the sky. The density of the sharp angstroms near the ground is 7-8 times or even more than ten times greater than the air, but it can still be suspended in the air, because its radius is small, and the impact force of molecular thermal motion on it can not be ignored, and they do Brownian motion, and the water droplets in the cloud are also very small, so Brownian motion can prevent it from falling, only when the temperature drops to a certain extent, plus the dust as the core, the water droplet hole is blind enough to come down! Two:

According to Boltzmann's law, particles are distributed according to the energy space, the particles with large energy occupy a high position, and the clouds are composed of some particles with relatively large energy, so the atmosphere will form multiple clouds according to the size of the energy, and the particle energy ** is mainly to absorb the energy of certain bands of sunlight, when the absorption and radiation reach a relative balance, the clouds can float and float at a relatively stable height, three: air convection.

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Problem description: Clouds are made up of tiny water droplets, water should be heavier than air, why do clouds float in the sky?

Analysis: Air is not a single gas, but a gaseous colloid with complex composition, which is what we often call liquid aerosols. He can be seen as a solvent in which the cloud exists as a colloid.

There are three forms of solutes in solvents: dissolution, colloidal, and precipitate. The specific form of existence depends on the size of the solute particles. The size of the water droplets in the cloud determines that it is a regionally uniform and stable colloid.

This has to do with the cause of clouds.

Cloud formation is mainly caused by condensation of water vapor.

The water surface of rivers, lakes and seas, as well as the water of soil, animals and plants, evaporates into the air at any time and becomes water vapor. When water vapour enters the atmosphere, it becomes clouds that cause rain, or condenses into frost and dew, and then returns to the ground, seeping into the soil or flowing into rivers, lakes and seas. Later, it evaporates (sublimation) again, and then condenses (condensation) and declines.

The cycle goes on and on.

After the water vapor enters the lower atmosphere from the evaporation surface, the temperature here is high, and the water vapor contained is more, and if the hot and humid air is lifted, the temperature will gradually decrease, and at a certain height, the water vapor in the air will reach saturation. If the air continues to be lifted, excess water vapor will be precipitated. If the temperature is higher than 0°C, the excess water vapor will condense into small droplets; If the temperature is below 0 °C, the excess water vapor condenses into Xiaoice crystals.

When these small water droplets and Xiaoice crystals gradually increase to the point where the human eye can recognize them, they are clouds.

When you see the above, you should know that the cloud is the continuous rise of water vapor, which is first hot and then cold, causing part of the water vapor to saturate and precipitate, which is the cloud we see. So we can only see clouds at high altitudes, that is, we feel that the clouds are floating in the air, and the water vapor cannot be seen by Qiao Bu Xian before it precipitates, so we can't see the clouds at low altitudes.

Reason: The cloud is made up of many water droplets, and the water droplets themselves are moving, so the clouds are also moving; In addition, even if the cloud itself does not move, the wind in the air will drive it to move;

Even if there is no wind, we are on the earth, with the earth as the relative stationary, and the clouds are high in the sky, and there is a relative motion relationship with the earth, which is also a relative motion relationship with us, and we see that the clouds are also floating when we see them. In short, the clouds just flutter in the sky.

Clouds are formed when air containing water vapor rises, and due to the flow of air, water vapor is produced, so that white clouds are called.

Clouds are small water droplets in the air that appear to be white and white because they are far away from us and at a higher position. If it were on land, it would not be called a cloud, but a fog.

Cloud color: The sky has clouds of various colors, some are white, some are jet black, some are gray, and some glow red and purple. Here, the thickness of the clouds determines the color, and the thickness of the various clouds we see varies greatly, with a thickness of up to 7-8 kilometers and a thin one of only a few tens of meters. There are many types of stratiform clouds, solitary cumulinary clouds, and undulating clouds.

Very thick stratiform clouds, or cumulonimbus clouds, where the light of the sun and moon is difficult to penetrate, and the clouds appear very dark; Slightly thinner stratiform and undulating clouds, which appear gray, especially undulating clouds, with more grayish colors at the edges of the clouds;

Very thin clouds, light is easy to pass through, especially thin clouds composed of ice crystals, the filaments appear particularly bright in the sun, with a silky luster, and even if there are such stratiform clouds in the sky, ground objects will still reflect shadows in the light of the sun and the moon.

Sometimes the clouds are so thin that they are barely visible, but as long as one or several large rings are found near the sun and moon, it can still be concluded that there are clouds, which are called "cirrostratus clouds". Isolated cumulonial clouds, which appear to be white because of the thicker cloud layer and the sunny side, where the light is almost entirely reflected; On the backlit side and its bottom, the light is not easy to transmit, and it looks grayish and black.

Although the density of water is greater than that of air and does not float, when water is evaporated into water vapor, the water vapor is much less dense than the air, so it rises under the buoyancy of the air, but the higher the density of the air, the thinner it is, the higher and colder it gets, so when the water vapor rises to the same density of the air as it, it does not rise, and it liquefies or condenses into small droplets or Xiaoice particles from the ground, and it becomes a white cloud.

Clouds are actually small water droplets, which belong to liquid water, and because of their light mass and large size, they have greater buoyancy, so they float in the air.

Our mood always changes according to the weather, clear skies will make people's mood better, clouds floating in the sky look like balloons, so do you know how much a cloud weighs.

Density Little Brother Park everyone is everyone.

Because the white clouds have become lighter, the white clouds will fly.