White clouds floated in the sky for a while.

White clouds are floating in the sky, turning into ponies, sheep and flowers. It's amazing!

Brief introduction to nouns:

Clouds are the tangible result of the huge water cycle on the earth. The sun shines on the surface of the earth, and water evaporates to form water vapor. Once the water vapor is supersaturated, water molecules will gather around the dust (condensation nucleus) in the air, and the generated water droplets or ice crystals will scatter sunlight in all directions, thus creating the appearance of clouds. Moreover, clouds can form various shapes, and they are divided into many kinds because of their different heights and shapes in the sky.

Strength profile:

The intensity of clouds is measured by the number of clouds (the percentage of clouds in the sky, divided into total clouds and low clouds), which are divided into three grades: the sky is clear without clouds or scattered clouds, but the amount of clouds is less than the sky area110; There are four? 70% of the low-middle clouds are still 6? 10% of the high clouds are cloudy; More than 80% of the medium and low clouds are cloudy.

Impact:

Clouds absorb heat from the ground and radiate it back, which helps to keep the earth warm. However, clouds also reflect sunlight directly back into space, which has a cooling effect. Which effect is dominant depends on the shape and location of the cloud. In the atmosphere more than ten kilometers from the ground, the closer to the ground, the higher the temperature and the richer the air; The higher the altitude, the lower the temperature and the thinner the air.

See the weather from the clouds:

Long-term observation and practice show that the generation and dissipation of clouds, as well as the evolution and transformation between various clouds, are carried out under certain water vapor conditions and atmospheric movement conditions. People can't see water vapor or atmospheric movement, but we can see every move of water vapor and atmospheric movement from the evolution of clouds, and water vapor and atmospheric movement play an extremely important role in weather phenomena such as rain, snow, freezing hail.

For thousands of years, the working people in our country have summed up the rich experience of "knowing the sky by observing the clouds" according to the changes in the shape, direction, moving speed, thickness and color of clouds in production practice, and compiled these experiences into proverbs. Here, we have summarized these proverbs about "knowing the weather from the clouds", and interested friends may wish to pay attention to some observations and comparisons.