How is the wind speed rating divided?
Horizontal movement of air relative to the ground. Expressed by wind direction, wind speed (or wind level). In meteorology and agriculture, wind speed has important practical significance. Because of this, wind-speed-related test instruments continue to emerge. Wind anemometer is one of the most typical instruments for measuring wind speed and wind direction. The distance the wind moves in a unit of time is called the wind speed, and the unit is m/s or kilometer/hour; the moving direction is called wind direction. In life, we can classify the wind speed into 17 levels according to the size of the wind speed. The division of wind speed levels was first described by astronomers in China.
The direct cause of wind formation is the horizontal pressure gradient force. The wind is affected by the general effects of atmospheric circulation, topography, and waters, and its manifestations are various, such as monsoons, local land and sea breeze, valley winds, and foyers. Simply put, the wind is the movement of air molecules. Wind is one of the environmental factors of agricultural production. Moderate wind speed plays an important role in improving the environmental conditions of farmland. Near-ground heat exchange, farmland evapotranspiration, and transport of carbon dioxide and oxygen in the air are accelerated or enhanced as the wind speed increases. Wind can spread plant pollen and seeds and help plants pollinate and reproduce. It can be seen that the wind plays an important role in agriculture. Modern agriculture requires us to grasp the wind direction and speed in the air in real time so that we can make quicker measures. In addition, according to the adjustment of the wind speed, we have invented the seed winnowing instrument in the field of seed inspection. It is based on the variable size of the wind and the different floating speeds of the particles in the air.
In 1805, according to the English version of "Fengcis Beanfort" written by the astronomer Li Zhifeng of the Tang Dynasty in Britain, Frincis Beanfort set the wind power to 13 levels, with the lowest 0 level and the largest 12 level. The wind speed of class 0 is 0.0-0.2 m/s, which is called no wind, and the poem of Tang Dynasty poet Wang Wei “makes it to the plugâ€, “Vertical solitary smoke in the desert and sunset over the long river,†describes 0-level scenery; Grade 1 The wind speed is 0.3 to 1.5 m/s, which is called soft wind. The wind speeds included in each level gradually increase from the bottom up. For example, the wind speed at level 3 is 3.4 to 5.4 m/s, which is called breeze, and the difference between the upper and lower winds is 2.0 m/s; the wind speed at level 4 is 5.5 to 7.9 m/s. The second, known as the wind, is 2.4 meters/second. The wind level created by Beaufort is scientific, accurate, popular, and applicable. It has been recognized and adopted by the meteorological community and the entire scientific community. Later, with regard to the determination of the wind direction wind speed, we used a simple instrument test method. Because the instrument is quick and convenient, the wind direction wind speed monitor has received more and more favorable comments in various aspects.
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