What are the scientific knowledge about wind?

The scientific knowledge about wind includes:

1. Wind is an air flow phenomenon on the earth, which is generally caused by solar radiant heat. 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 laterally, and the rising air gradually cools and becomes heavier and falls, and the air heats up to rise due to the high surface temperature, and this air flow is called wind.

2. When the flow speed of the air is large and small, it will make the wind suddenly big and small, and there will be a burst of feeling on the human body, which is the gust of wind recognized in life.

3. When the air crosses the ridge, due to the sinking of the air, a warm (or hot) and dry wind is prone to occur on the leeward slope, which is called foehn.

4. A kind of air vortex that extends from the cumulonimbus cloud to the ground with a small range and great destructive power. A landspout that occurs on land is called a landspout, and a seaspout that occurs on the ocean is called a seaspout, also known as a waterspout.

A tornado is a violent storm with a strong rotational force, with wind speeds of up to more than 100 meters per second.

5. In coastal areas, the wind blows from the sea to the mainland during the day, and blows from the land to the sea at night.

Wind is a natural phenomenon caused by the movement of air, and it is caused by the heat of solar radiation. Sunlight shines on the surface of the earth, so that the surface temperature rises, the surface air is heated and expands lightly and rises, after the hot air rises, the cold air at low temperature flows horizontally, and the rising air falls because it gradually cools and becomes heavier, and because the surface temperature is higher, the air will heat up and make it rise, and the flow of this air produces wind. From a scientific point of view, wind often refers to the horizontal motion component of air, including direction and magnitude, i.e. wind direction and speed, but for flight, it also includes the vertical motion component, the so-called vertical or ascending air flow, where the wind moves the object in the direction of the object (mass of matter).

The air flow forms the wind, so the wind is the phenomenon of air flow, generally caused by the heat of solar radiation on the surface of the earth, so that the surface temperature rises, the surface air is set to flesh two and expand lighter, and after the upward hot air rises, the cold air at low temperature is much like the inflow of rising air has gradually cooled, and becomes heavier and falls. Because the surface temperature is high, the air is heated and rises, and this air flow is the wind.

Wind is a natural phenomenon caused by the movement of air.

Cause: When the accumulated water vapor forms water, the volume decreases, and the surrounding water vapor comes to replenish, forming wind.

Function: 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 energy is a widely distributed and inexhaustible source of energy.

Wind can also have a negative effect on agriculture. It can transmit pathogens and spread plant diseases. High-altitude wind is the meteorological condition for long-distance migration of pests such as armyworms, rice planthoppers, rice leaf rollers, and locusts.

Strong winds cause mechanical abrasion of leaves, lodging of crops, broken trees, and loss of flowers and fruits, which affect yields. The high winds also caused soil erosion and sand dunes to move wildland, destroying farmland.

Classification: According to the phenomenon caused by the wind on the ground objects, the magnitude of the wind is divided into 13 grades: no wind, soft wind, light wind, light breeze, first eye and wind, clear wind, strong wind, strong wind, strong wind, strong wind, strong wind, storm, squallane, hurricane.

1. Wind is a phenomenon caused by the movement of air, which is caused by the heat of solar radiation. Sunlight shines on the surface of the earth, which increases the temperature of the surface of the beam, and the air on the surface of the surface expands lightly due to heating and rises. When 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 the air is heated to rise because the surface air temperature is high, and the flow of this air produces wind.

2. Wind often refers to the horizontal movement component of air, including the direction and magnitude of hail, that is, wind direction and wind speed; But in the case of flight, it 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 wind speed is fast.

Relative to the movement of air on the earth's surface, wind usually refers to its horizontal component. Wind is a vector quantity, expressed in terms of wind direction, wind speed, or wind force. Wind direction refers to the direction of the air flow, which is often recorded in 16 directions.

Wind speed is the horizontal distance that air travels in a unit of time, measured in meters and seconds. The horizontal wind speed in the atmosphere is generally meters, and sometimes it reaches 102 meters and seconds in typhoons and tornadoes. Wind speeds in farmland can be less than milliseconds.

There are two types of wind speed observations: instantaneous value and average value, and the average value is generally used. Wind measurements are mostly carried out with electric wind direction anemometers, portable anemometers, dyne wind direction anemometers, and thermobulon breeze meters used to measure the breeze in farmland. It can also be estimated according to the wind scale based on the ground object signs.

2017-12-17

Wind force refers to the amount of force that the wind exhibits when it hits an object. Generally, according to the various phenomena caused by the wind blowing on the ground or water surface, the wind force is divided into 13 levels, with the minimum being 0 and the maximum being 12. According to the national standard of "wind level" issued by China in June 2012, according to the wind speed at a height of 10 meters in the standard meteorological observation field, the wind level is divided into 18 levels, and there are three commonly used units to express wind speed, namely nautical mile hours, meter seconds, and kilometers per hour, and the commonly used units in typhoon forecasting in China are meter seconds.

In 2001, the China Meteorological Administration (CMA) issued the Regulations on Typhoon Operations and Services, supplementing typhoons above 12 to 17 on the Beaufort Wind Scale. Category 12 typhoon is set at meter seconds; Level 13 is meter seconds; Level 14 is the meter second, level 15 is the meter second, level 16 is the meter second, and level 17 is the meter second. In the typhoon in Qionghai 30 years ago, the maximum wind force near the center was 73 meters per second, which has exceeded the maximum standard of 17.

It is called 18, which is also a common saying in the international maritime community about a mega typhoon.

Now, whether it is in the vast grasslands or in the mountains of Gaogao, we will see wind power stations that can withstand storms and operate stably. Whenever a strong wind comes, the collector will automatically turn the direction to meet the sharpness of the wind, no matter how strong the wind is, how fierce it is, it will take it all, turn it into electrical energy and store it to provide people with electricity. In this way, even in the countryside and pastures far from the city, electricity can be used and a happy life can be lived.

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 region. 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.

Some of the changes in atmospheric 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 zone of relatively high pressure to a zone of low pressure 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.

1. What is wind? The horizontal movement of air is called wind. Wind is a vector quantity.

So the wind includes the direction of the wind and the speed of the wind Wind direction refers to the direction in which the wind is blowing, expressed in sixteen directions, recorded in Latin abbreviations. For example, N, E, S, and W represent north, east, south, and west winds respectively; NE stands for northeasterly, SE stands for southeast, SW stands for southwest, and NW stands for northwest. Wind speed refers to the horizontal distance that an air particle moves in a unit of time, measured in meters and seconds.

When the wind speed reaches meters and seconds or more, it is called a gale 2.How is the wind driven? How is the wind caused, why does it sometimes blow south and sometimes north, and why does the wind have a size? The answer is very simple, it is caused by the uneven atmospheric pressure The driving force that makes the wind drive is the sun, and the solar radiation is uneven in the distribution of heat on the earth, so that the earth forms different high and low pressure bands and wind bands, just like water flows to low places, the air also flows from high pressure to low pressure.

However, due to the rotation of the earth, the air movement is deflected (right in the northern hemisphere and left in the southern hemisphere), coupled with the undulating mountains on the earth's surface and the uneven distribution of land and sea, which has a further impact on the air, and the combined influence of small topography and underlying surface makes the local wind conditions more complicated. 3. What is sea and land breeze? Residents of coastal areas and larger islands know that winds often blow from the sea during the day and from the land to the sea at night.

It is caused by the difference in the heat capacity of land and sea, the land has less specific heat, warms up faster during the day, and cools faster at night. The specific heat of the ocean is large, and there is no significant change in the temperature of the day. As a result, the air over the land expands and rises during the day, turning into a zone of low pressure, and colder and heavier air flows from the ocean into the land, replenishing the rising hotter air and forming the sea breeze.

At night, the land cools quickly, the temperature is lower than the ocean surface, and it becomes a high-pressure area, the air temperature on the ocean surface is higher and rises, and the land blows colder and heavier air to supplement it, forming a land breeze 4. What is the valley wind? In larger mountainous areas, there is a valley breeze that blows from the valley to the top of the mountain during the day, and at night it is the opposite of the mountain wind, which blows from the top of the mountain to the valley, called the valley wind, and its formation is similar to the sea and land breeze. During the day, when the sun shines hotter on the slopes than the air at the same height on the slopes, an updraft is created that causes the cooler, heavier air over the valley to sink and form a valley wind that blows up the valley along the slopes.

At night, the slopes cool rapidly, faster than the surrounding air at the same height, so that the warmer air rises over the valley and the cooler and heavier air sinks down the slopes to form a mountain breeze.

Gust of wind: When the speed of air flow is large and small, it will make the wind suddenly become big and small, and there will be a gust of feeling on the human body, which is the gust of wind recognized in life.