What is the basic state of the atmosphere?

The air around the earth is called the atmosphere. Just like fish living in water, we humans live at the bottom of the earth's atmosphere and can't live without it for a moment. The atmosphere provides an ideal environment for the reproduction of life on earth and the development of human beings. Its state and changes always affect human activities and survival everywhere. Atmospheric science is the study of the atmosphere. It studies the specific situation of the atmosphere, including its composition, distribution and change, the structure, basic properties and the motion law of the dominant state of the atmosphere.

The movement of the atmosphere is caused by the exchange of heat energy in the atmosphere, which mainly comes from the sun. The exchange of heat energy makes the temperature of the atmosphere rise and fall. The movement of air and the change of air pressure system make the energy and materials between land, north and south, ground and sky exchange continuously, resulting in complex meteorological and climate changes. Based on fluid mechanics and thermodynamics, atmospheric science will deeply study various circulation systems and weather systems in the atmosphere, as well as the essence and phenomena of atmospheric movement from the aspects of pressure change, pressure field and pressure system formed by uneven pressure distribution, various situations of air movement in various layers of the atmosphere, wind phenomena and properties. Phenomenologically speaking, weather is mainly the result of moisture changes in the atmosphere. Under the combined action of solar radiation, underlying surface forcing and atmospheric circulation, the long-term comprehensive situation of weather is called climate. Atmospheric science will study the causes of climate, climate conditions in different regions, climate change and the impact of human activities on climate.