Why is it windy, why is it windy?

Every time the wind blows, my heart is always irritable about it. Maybe you've studied geography and you'll explain it with the knowledge of high pressure, low pressure, cold air, and warm air, but it wasn't until I heard a middle-aged rural woman's explanation of the spring breeze that I really calmed down every time the wind came. This was a trip to work, and since it was outside the city, the bus had to pass through a large field of crops every time, and there would always be many local farmers in the car.

This is where this middle-aged woman and I met. It was also windy that day, very big, very dirty, and there was a hint of dissatisfaction in everyone's expressions. Only this middle-aged woman was different, she smiled brightly, perhaps passing by their land, she said, as soon as the wind blew, it woke up the ground that had been frozen for a winter, and the bones were crisp, the ground was soft, and the crops were grown.

Believe it or not, she pointed out to the people in the car that we poured enough water on the land in the winter, and the water froze into ice, and the land also froze, and the land could rest for a whole winter under the protection of this layer of ice. In the spring the weather is warm, the ice melts, and if there is no wind, the land will be lazy and not remember, sticking to a ball, and as soon as the wind blows, it will blow it awake, it will be loose and soft, and we can sow it. Following the direction of her finger, I looked, and sure enough, the ground that had been frozen hard looked like it had been turned over by a farmer with a shovel.

The spring breeze can wake up the land, so the wind will blow in the spring. When I got this answer, I smiled, raised my face, and bathed in the spring breeze.

The flow of air becomes the wind, so why does the air flow? Is it because of the pressure gradient, so why is the pressure gradient generated? Is it because of the heat gradient that is generated, so why is the heat gradient generated?

It is because the sun moves towards the Tropic of Cancer in spring, the earth warms up, and due to the different surface shapes, the heating and heat dissipation rates are different, which is why the spring is windy! Why does a pressure gradient produce air movement? From the perspective of equilibrium thermodynamics, the difference in chemical potential belongs to a non-equilibrium system, and its ultimate state is that the chemical potential tends to be equal (equilibrium) everywhere, so the whole system will produce chemical potential energy transfer between different regions, and the chemical potential will flow from the high place to the low place until the field energy of the two regions is equal to reach equilibrium.

Therefore, the cause of wind lies in the different energy states of different regions, and wind is a form of energy transfer! ]

The flow of air produces wind, and there are two reasons for the flow of air. Cause of temperature: Air is very sensitive to temperature, and a slight change in temperature will cause the air to expand or contract.

The air expands at high temperatures and shrinks at low temperatures. The air at the expansion area will circulate in the direction of the air at the contraction area, forming a wind. Barometric pressure issues:

Air is also very sensitive to air pressure, and even if the air pressure changes slightly, the air will also circulate. Under the action of pressure, the air in the high-pressure area circulates to the air in the low-pressure area to form a wind. ]

The earth absorbs the heat of the sun, and due to the uneven heating of each part of the ground, the air is not the same degree of cold and warm, and the warm air expands and rises after becoming lighter; The cold air cools and becomes heavier and then falls, so that the cold and warm air flows and forms the wind, and Mount Everest is mainly squeezed by a huge force due to the collision of continents, and the earth's crust changes on a large scale. ]

First of all, the wind is formed by the movement of air. Why does air move? Due to thermal convection: the temperature of the upper and lower air layers is different, the cold air drops and the hot air rises, resulting in air convection, and once the air flows, wind is formed. ]

Wind is a natural phenomenon, I believe many friends are used to seeing it, but how is the wind on the earth formed? Maybe many friends don't know, let's learn about the wind together.

Wind is a natural phenomenon caused by the flow of air, which is generated by the heat of solar radiation, and the flow of air caused by high and low pressure between two regions is generated.

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 in the case of flight, the clearance also includes the 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 horizontal movement of air is called wind. Wind is a physical quantity that represents the movement of air currents. It has not only a numerical value (wind speed), but also a direction (wind direction).

Wind direction refers to the direction in which the wind is blowing, for example, a north wind refers to the flow of air from north to south. The wind direction is generally expressed in 8 directions. They are: North, Northeast, East, Southeast, South, Southwest, West, Northwest.

Wind speed refers to the horizontal distance that air travels per unit of time. According to the phenomenon caused by the wind on the ground objects, the magnitude of the wind is divided into 13 levels, which are called wind levels, referred to as wind levels.

Wind is one of the environmental factors in agricultural production. Moderate wind speed plays an important role in improving the environmental conditions of farmland. The heat exchange near the surface, evapotranspiration of farmland and the transport of carbon dioxide and oxygen in the air are accelerated or strengthened with the increase of wind speed.

Wind spreads plant pollen, seeds, and helps plants pollinate and reproduce.

Wind formation: Sunlight shines on the earth's surface, causing the surface temperature to rise, and the air on the surface of the earth expands lightly and rises. 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.

When the accumulated water vapor (cloud) hail is collected and formed into water, the volume shrinks, and the surrounding water vapor comes to replenish, forming wind. The wind on the earth is related to the water source, and the wind is produced by the expansion and contraction of water and water vapor.

If the wind source blows from the sea to the land, or the land blows to the sea, the air and water vapor on the ground are high in summer, and the air and water vapor with a large proportion of the sea surface should supplement the ground air space, and the sea surface temperature is low and the air shrinks. It is necessary to replenish the air space on the sea surface by the air and water vapor that expands and rises from the high temperature on the ground.

Extended Materials. Wind is one of the environmental factors in agricultural production. Moderate wind speed plays an important role in improving the environmental conditions of farmland. The heat exchange in the near-surface layer, evapotranspiration in the field and the transport of carbon dioxide and oxygen in the air are accelerated or strengthened with the increase of wind speed.

Wind spreads plant pollen, seeds, and helps plants pollinate and reproduce. The monsoon prevails in China, which is beneficial for crop growth.

Wind energy is a widely distributed and inexhaustible source of energy. In the Inner Mongolia Plateau, the Northeast Plateau, the southeast coast and the inland mountains, there are abundant wind energy resources that can be used as energy resources.

February 6, 2018 Sunny Wednesday.

Two days ago, I went out with my mother to play, and the wind outside Zhenyan was blowing so strongly! My face hurts when the wind blows, and I wonder where did the wind come from? So I checked the information, and it just so happened that I had a copy of "100,000 Whys".

So, I took a look at the table of contents, what page is it on? I found it on page 18. Its title is:

Why is it windy? Because, when the sun turns the air hot red, the hot air expands and rises into the air, and the cold air in the air is squeezed to the ground. Cold air and hot air are constantly "moving", and as a result, wind is formed.

It turns out that there are many mysteries waiting for us to discover, and there is a lot of knowledge for us to explore.