How air forms wind, and what is air that makes the wind

Because of the angle between the Earth's axis of rotation and the axis of revolution around the Sun, the angle of solar irradiation is different for different places on Earth, and this angle also varies for the same place 365 days a year, so the solar radiation energy received by a certain place on Earth is also constantly changing. The Earth's north and south poles receive less solar radiation energy, so the temperature is low and the air pressure is high; Whereas, the equator receives more heat, has a high temperature, and has low air pressure. In addition, as the earth rotates, there are diurnal variations in temperature and air pressure.

In this way, due to the changes in temperature and pressure on the earth's surface, the air flow will move from high pressure to low pressure in order to transport heat from the tropics to the poles, thus forming winds in different directions and accompanied by different meteorological changes. Ocean currents in the ocean play a similar role. On a global scale, the air currents in the atmosphere are a huge energy transport medium, and the rotation of the Earth further promotes the formation of semi-permanent planetary-scale circulation in the atmosphere.

The topography and landforms of various parts of the earth will also affect the formation of wind, such as the seaside, due to the large heat capacity of seawater, after receiving solar radiation energy, the surface temperature rises slowly, and the land heat capacity is small, and the temperature rises relatively quickly. As a result, during the day, due to the high temperature of the land air, the air rises, forming a sea and land breeze that blows from the sea surface to the land. On the other hand, at night, the sea cools slowly, the air temperature on the sea surface is high, and the air rises, forming a land and sea breeze that blows from the land to the sea.

In mountainous areas, the sun warms the air in the mountains during the day, and as the hot air rises, the cold air from the valley moves upwards to form the "valley wind". On the contrary, at night, the heat in the air is dissipated to a higher place, the density of the gas increases, and the air moves down the hillside, forming the so-called "mountain wind".

The flow of air forms the wind.

Solar radiation, which promotes the movement of air, causes the temperature to rise, and the air pressure changes as a result, causing the flow of high pressure to low pressure.

This is an abbreviated way of saying it.

Wind is formed by the horizontal movement of air, and wind is a natural phenomenon caused by the movement of air, which is caused by the heat of solar radiation. Sunlight.

When irradiated on the earth's surface, the surface temperature rises, and the air on the surface expands lightly and rises due to heating. When the hot air rises, the cold air at a low temperature flows in laterally, and the rising air cools and becomes heavier and falls, and the air heats up to rise due to the high surface temperature, and the flow of this air generates wind.

From a scientific point of view, wind often refers to the horizontal movement component of air, including direction and magnitude, i.e., wind direction and speed; But for flight, it also includes a vertical motion component, the so-called vertical or ascending airflow. Gale moves objects in relation to the direction of the object (mass of matter). The speed of the wind is fast.

The direct cause of the formation of wind is the horizontal pressure gradient force. Wind is affected by different factors such as atmospheric circulation, topography, and water, and has a variety of manifestations, such as monsoon, local sea and land breeze, valley wind, foehn wind, etc. To put it simply, wind is the movement of air molecules.

To understand the causes of wind, we must first clarify two key concepts: air and air pressure. The composition of the air includes:

Nitrogen molecules (78% of the total volume of air), oxygen molecules (about 21%), water vapor, and other trace components. All the air molecules were moving at a rapid pace, colliding with each other and with anything on the horizon.

Air pressure can be defined as: the amount of pressure exerted by air molecules in a given area. Generally speaking, the more air molecules are present in a certain area, the greater the air pressure in that area. Correspondingly, wind is the result of the action of a pressure gradient force.

Depression. Some changes in air pressure are caused by storms, some are caused by uneven surface heating, and some are caused by atmospheric molecules being forced to flow from a relatively high pressure zone to a low pressure zone in a certain horizontal area.

Most of the high-pressure and low-pressure bands shown on the weather map just form a mild breeze that accompanies us. The difference in air pressure required to produce a breeze is only 1% of the atmospheric pressure itself, and this change in air pressure occurs over many areas. Comparatively speaking, the formation of severe storms results from changes in larger, more concentrated areas of pressure.

Wind is a natural phenomenon caused by air flow, which is caused by solar radiation heat and the sun's rays shine on the earth's surface, causing the surface temperature to rise, and the air on the surface of the earth is heated and expands lightly and rises.

After the hot air rises, the cold air at a low temperature flows in laterally, and the rising air gradually cools and becomes heavier and falls, and because the surface temperature is high, hot air will be added to make it rise, and the flow of this air produces wind.

Extended knowledge: Wind speed units are commonly expressed in m s, knot (knots, also known as knots), and km h, and their conversion relationships are as follows.

1m/s= 1knot=

1km/h= 1knot=1/2m/s

The expression of wind speed is sometimes used as pressure, which is called wind pressure. If v is used to denote the wind speed (m s) and p is perpendicular to the direction of the wind, the pressure of the wind on the area of 1m2 kg m2 is the relation p=

The flow of air in the horizontal direction is called wind. Wind is the result of the movement of air from one place to another due to heat or cold.

We know that the sun shines on different areas of the earth's surface, and when the air is exposed to sunlight, it causes the air to be hot in some places and cold in others. The hot air is relatively light, and it is easy to fly high and rise above the cold air around it; Cold air, on the other hand, is heavier and flows to a place with lighter air, so the air flows, and wind is generated.

So it's the temperature.

Wind is a phenomenon caused by the movement of air. The winds of the earth's old worms are produced due to the difference in air pressure in the atmosphere, which causes the air to flow from the area of high pressure to the area of low pressure. When the earth's surface is heated or cooled differently, there will be a difference in temperature and clarity, which in turn will lead to a corresponding difference in air pressure, causing the generation and flow of wind.

For example, hot air is lighter than cold air, forming a high-pressure zone, while cold air is heavier than hot air, forming a low-pressure zone. A pressure gradient is formed between the area of high pressure and the area of low pressure, and when the difference in air pressure reaches a certain level, the air will flow from high pressure to low pressure along the pressure gradient, forming wind.

In addition, the rotation of the earth also affects the direction and speed of the wind. Due to the continuous rotation of the earth, the earth's surface is buried in different latitude zones, and the climate and wind direction are different from the equator to the poles. For example, tropical cyclones in the equatorial region are relatively common large cyclones that form due to the continuous flow of hot air from the equator to the poles.

In conclusion, wind is a phenomenon of air movement caused by differences in air pressure within the Earth's atmosphere, and its direction and speed are affected by a variety of factors.

When air flows from a place with high air pressure to a place with low air pressure, wind is generated. The wind is actually the movement of air. So, what drives the winds in nature? This is related to the thermal expansion and contraction of air.

Every day, sunlight radiates to the ground, and the ground is heated. On Earth, land is more susceptible to heat than oceans; Deserts are more prone to heat than forests; The layer of air near the ground heats up faster than the layer of air at height. As a result, the heated air expands and rises rapidly, so the nearby cold air fills up, and the supplemented cold air rises when heated, and the nearby cold air replenishes, so that the hot and cold air flows to form wind.

The faster the air moves, the stronger the wind. According to the magnitude of the wind, people divide the wind into 0-12 levels, a total of 13 levels. The "0" pole indicates that there is no wind; "2-3" indicates light and light winds; "8" is gale-high; "10", "11", "12" are in squall, storm and hurricane, respectively.

China is located in the eastern part of the Asian continent, the southeast is the ocean, generally speaking, the southeast wind in summer and the northwest wind in winter. This is due to the fact that in summer, the air on the continent is warmer than the air on the ocean, and when the hot air on the continent rises, the cold air on the ocean flows to the continent, so the southeast wind often blows; In winter, the air over the ocean is warmer than the air on the continent, and the cold air on the continent moves towards the ocean, so the northwest wind often blows.