What are the grades of wind speed according to the size of the wind?

When air flows, it becomes wind. The faster the air moves, the stronger the wind. For a wide range of air, its movement is different from top to bottom and from left to right. Meteorology calls the up-and-down movement of air vertical movement, also called convection, and the horizontal movement of air is wind.

The horizontal flow of air is caused by the uneven distribution of temperature and pressure in various places. The law of air flow is from a place with high air pressure to a place with low air pressure, so wind is produced. The greater the pressure difference between high pressure and low pressure, the faster the air flows and the greater the wind blows.

To know the wind, one must know the wind direction and speed. It is customary to set the wind direction as the wind direction. For example, the northwest wind refers to the wind blowing from the northwest; The southeast wind is the wind blowing from the southeast. Wind speed refers to the distance that air flows in unit time. The wind speed is divided into 0- 12 13 grades according to the wind power. The corresponding relationship between wind speed and wind level can be expressed in the right table.

Although the wind scale is 12, the actual wind speed in nature is much larger, for example, the wind speed of a tornado even reaches more than 200 meters per second.

Wind is the main factor of weather change, and different wind energy produces completely different weather. In addition to the constant trade winds and seasonal monsoon, there are various winds on the earth, such as typhoon, tornado, sea-land wind, valley wind, foehn wind, Blah wind and dry-hot wind.

Wind has both advantages and disadvantages for human beings. The annual monsoon brings a lot of rain to most parts of our country. Strong winds are inexhaustible pollution-free energy. However, strong winds, typhoons, tornadoes and dry-hot winds will bring great threats to people's lives, property and agricultural production.

Comparison table of wind grade and wind speed

Wind speed (m/s) 0 No wind 0-0.2 1 breeze 0.3- 1.52 breeze 1.6-3.33 breeze 3.4-5.44 and breeze 5.5-7.95 breeze 8.0- 10.76 strong wind. 20.79 gale 20.8-24.4 10 gale 24.5-28.4 1 1 storm 28.5-32.438+02 hurricane 32.7-36.9.