What does dressing index in the lower left corner of the weather forecast of CCTV news channel Wen Chao Tian Xia mean?

As we all know, people are warm-blooded animals, but the temperature in nature is not fixed. In order to adapt to the Leng Xia fever in winter which changes periodically throughout the year, people not only adjust themselves, but also dress is the most direct "defense line" for the human body to adapt to adverse meteorological conditions.

Just like a thermos can keep warm, people usually put on clothes, which can save13 of the heat lost to the outside world on average. It has been studied that the temperature difference between the outside air and the surface of clothes is different for different clothes. When the temperature difference between the air temperature and the naked part of the body is 15.6 degrees to 17 degrees, the temperature difference between the air temperature and the clothes surface is 1 1.8 degrees when wearing a shirt; Wearing a shirt and vest is 9.9 degrees; Wearing a shirt, vest and coat is 6.3 degrees. It is not difficult to see that the thicker the clothes, the better the warmth.

Experts also pointed out that the thickness of clothes is not only related to the temperature, but also related to the size of the wind. Generally speaking, when the temperature is constant and the wind force is below level 3, the thickness of clothes changes little with the wind force. However, when the wind force is greater than 4, the range of clothing thickening will increase rapidly.

In order to meet the needs of people's life, let people choose and wear comfortable clothes in four seasons. According to the meteorological conditions that have the greatest influence on human body temperature, such as temperature, wind and humidity, meteorologists have created a meteorological index that is closer to people's lives, called dressing index, to remind people to dress in time according to the weather changes, so as to reduce the occurrence of diseases. The dressing index designated by Beijing Professional Meteorological Observatory is Grade 8. The smaller the index, the thinner the clothes. Generally speaking, 1-2 is summer clothes, which refers to short clothes with a thickness below 4 mm; Grade 3-5 is the out-of-season clothing in the Spring and Autumn Period, including single clothes, double clothes, windbreakers and sweaters, and the clothing thickness is about 4-15 mm; Grade 6-8 is winter clothes, mainly referring to cotton-padded jackets, down jackets, leather clothes, etc. Its clothing thickness is above 15mm.

Dressing index released by Chongqing Professional Meteorological Observatory is a special meteorological product that is very close to the public. It has been published in the "Meteorological Service" program of Chongqing TV Station, the "96 12 1" information desk and newspapers, etc., providing dressing index and people with styles suitable for going out every day. Meteorologists remind everyone to pay attention to the daily dressing index forecast, because it can make you dress scientifically and comfortably; It can not only prevent diseases, but also spend a healthy spring, summer, autumn and winter.

Dressing index is divided into seven grades. The smaller the grade, the thinner the clothes are. 1 ~ 2 grade: summer dress, the clothing thickness is below 2mm, and grade 3 ~ 5 grade: spring and autumn transitional season dress, the clothing thickness is 2 ~ 15mm. Grade 6 ~ 7 is winter clothes, and the clothing thickness is above15 mm.

First-class > =3 1 degree short clothes, short skirts, thin skirts and shorts made of light cotton fabric.

Shirts, thin long skirts and thin T-shirts made of second-class cotton and linen fabrics with 26-30 degrees.

Short suits, T-shirts, thin denim shirts and trousers, casual wear and professional wear with three-grade 18-25 single-layer cotton and linen fabrics.

Level 4 12- 17 suits, jackets, windbreakers, casual wear, jackets, suits and thin sweaters.

Five-level 7- 1 1 degree windbreaker, coat, jacket, sweater, wool suit, suit, winter clothes.

Grade 6 1-6 cotton coat, winter coat, leather jacket, overcoat, thick sweater, leather hat, leather gloves, leather coat.

Level 7