How to distinguish the wind level?
Level 0 wind is also called no wind.
Level 2 wind is called breeze, the leaves are slightly noisy, and people feel windy.
Level 4 wind is called breeze, and the twigs of trees shake, which can blow up dust and paper on the ground.
The 6-level wind is called strong wind, the branches are shaking, the wires are whistling, and it is difficult to walk with an umbrella.
The 8-level wind is called gale, the twigs of trees can be broken, and people walk in the wind with great resistance.
10 wind is called gale, which is rare on land. Trees can be pulled up and buildings are seriously damaged.
Winds above 12 are called typhoons or hurricanes, which are extremely destructive and rarely seen on land.
Due to the difference of wind speed, wind direction and humidity, many types of wind will be produced. Blast, gale, gale, gale, storm and hurricane, these common wind types, Beaufort wind force are seven, eight, nine, ten, eleven and twelve respectively.
Wind power refers to the strength of the wind blowing on an object. Generally speaking, according to various phenomena caused by wind blowing on objects on the ground or water surface, the magnitude of wind power is divided into 18, with the smallest being 0 and the largest being 17.
Wind speed is the forward speed of the wind. The greater the air pressure difference between two adjacent places, the faster the air flow, the greater the wind speed and the greater the wind force. Therefore, the magnitude of wind is usually expressed by wind power. The unit of wind speed is meters per second or kilometers per hour. When the weather forecast is released, the wind level is mostly used.
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Extended data:
Wind is a natural phenomenon on the earth, which is caused by solar radiation heat. Sunlight shines on the earth's surface, causing the surface temperature to rise, and the surface air to expand and become lighter and lighter. After the hot air rises, the cold air with low temperature flows in horizontally, and the rising air falls down because it gradually cools and becomes heavier. Because the surface temperature is high, it will heat up the air, and this airflow will produce wind.
When the gathered water vapor (cloud) forms water, its volume shrinks, and the surrounding water vapor comes to replenish it, 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 steam. The wind blows from the ocean to the land, or the land blows to the ocean.
In summer, when the ground temperature is high, air and water vapor expand and rise, and the air space on the ground depends on the air and water vapor with a high proportion on the sea surface, while the air contracts when the sea surface temperature is low. It is necessary to supplement the air space on the sea surface with air and water vapor rising from air with high ground temperature. In winter, when the sea surface temperature is high, the sea surface air rises, and when the ground temperature is low, the proportion of air is heavy, which supplements the sea surface space along the ground.
References:
Baidu Encyclopedia-Level of Wind