List of new stoves in summer. Dressing guide?

The dressing guide for the list of new stoves in summer is to choose suitable clothes according to the temperature in the region.

Recently, the National Climate Center of China Meteorological Bureau released the list of hot summer cities in China to the public authority for the first time by comprehensively analyzing the meteorological data of provincial capitals and municipalities directly under the Central Government. The top 10 provincial capitals or municipalities directly under the central government are Chongqing, Fuzhou, Hangzhou, Nanchang, Changsha, Wuhan, Xi, Nanjing, Hefei and Nanning. Among them, the first four cities were named "the new four stoves" by many netizens. This time Wuhan was "surpassed" and missed the semi-finals! (Here's the irony! )?

(Image from the Internet)?

However, as soon as this authoritative list came out, netizens in many cities and regions expressed "dissatisfaction" and took photos of the temperature in their own cities. It seems that everyone is in the summer stove, and it is about to explode! ?

So, what clothes are the coolest and most sun-proof for us to wear in summer? How to prevent yourself from being baked into black charcoal and heated into a dog in a small stove or a big stove? ?

The netizen thought: "Are you stupid? Needless to say! Wearing white is definitely the coolest and can reflect ultraviolet rays! " However, the following scientific experiment may subvert your cognition! They will tell you one by one how to wear clothes in order to live happily in the stove from the color, material and type of clothes! Neither killed by heat nor tanned! ?

White is not the coolest?

The first most grounded experiment was like this: at noon 12, cotton T-shirts of three colors (red, black and white) of the same specification were placed on the concrete floor near the roof, and a thermometer was placed on each piece of clothing. Finally, the experimental results show that the thermometer in the white T-shirt shows the lowest value and white is the coolest when the exposure is less than 5 minutes in a short time. After 20 minutes of exposure, the situation reversed. The temperature of red T-shirts is lower than that of white T-shirts and black T-shirts. White has the worst sunscreen effect, and red is the coolest! ?

Why is this? Dark clothes absorb heat quickly, while white clothes absorb less heat and can reflect ultraviolet rays, so in a short time, the human body will feel cooler. Although light-colored clothes can reflect some ultraviolet rays, their ability to absorb ultraviolet rays is not good. Red light has a long wavelength, which can absorb a lot of ultraviolet rays in the sun, but it has the best sunscreen effect. So it is not difficult for everyone to understand why wearing red clothes is the coolest. If we use optics to make a concrete explanation, it is that wearing red clothes can reduce the harm of ultraviolet rays to the skin, because ultraviolet rays are the farthest and shortest rays in the seven-color spectrum of the sun and are easily absorbed by the longest red visible light, so wearing red clothes can absorb and filter out more solar ultraviolet rays, thus reducing the harm of ultraviolet rays to the skin. ?

Dark clothes are more UV-proof?

In fact, it is not only red clothes that can achieve the above sunscreen effect. An experimental study by Harvard University in the United States shows that it is cooler to wear dark clothes in summer than to wear white clothes. Experts point out that heat in the human body can be dissipated through radiation, conduction, convection and evaporation. It is true that black clothes absorb more heat than white clothes, but the absorbed heat can be converted into the driving force of convection in clothes (just like in summer afternoon, the ground is easily heated to form local convective weather, such as thunderstorm weather, which makes the weather cool), and air convection in clothes can take away sweat and part of the heat on the skin surface and send it out, so the human body will naturally feel cool. Of course, black clothes should be made loose, which can strengthen "convection" and increase the coolness of clothes. ?

In addition, wearing black clothes indoors or on cloudy days will exert its function of rapid heat dissipation, which can quickly discharge the heat on the skin surface and make people feel much cooler. The teacher pointed out that black clothes are the coolest when there is no sunshine. You can wear it indoors or on cloudy days, because there is little sunshine at this time, and black will not absorb heat quickly, but will only dissipate heat quickly, so that the heat on the skin surface can be discharged quickly, which is naturally cooler than clothes of other colors. ?

The sunscreen clothing in the advertisement is not as good as your cotton-padded jacket.

The anti-ultraviolet ability of clothes depends not only on color, but also on material. The SPF value (sun protection value) of cotton-padded jacket is15 ~ 40; The SPF value of light-colored polyester fiber clothes is 7 ~10; The SPF value of light knitted clothing is 4 ~ 9; Exposed arm skin is best protected by gauze shawls and sleeves. Therefore, if you want to prevent ultraviolet rays, you'd better wear dark cotton clothes. ?

Sunscreen clothing, chiffon skirts, chiffon shirts, quick-drying clothes ... This seemingly light and cool material is actually not "cool" at all. ?

In summer, people sweat a lot. Although the chemical fiber cloth is light and thin, it has poor water absorption and air permeability, so it is difficult for the skin to dissipate heat through sweat evaporation. Excessive retention of sweat will cause skin secretions to rot and ferment. In addition, synthetic fibers are mixed with monomer ammonia, methanol and other chemical components in the production process, which is very irritating to the skin and easy to induce allergies and dermatitis. ?

In contrast, natural fibers such as cotton, hemp and silk are the first choice in high temperature days. Silk is skin-friendly, thinner and cooler. Cotton-padded jacket absorbs sweat and has good breathability; Flax material has large pores and good air permeability and water absorption.

According to industry experts, in fact, an ordinary T-shirt is better than any sunscreen, which can isolate 95% of ultraviolet rays. As far as texture is concerned, polyester >: nylon > artificial cotton and silk; Among natural fibers, flax >: hemp > cotton silk.

In addition, a research report of the British Radiation Protection Committee pointed out that light yellow cotton fabric has the worst sun protection effect, and its sun protection coefficient is only 7. After soaking, the sunscreen effect drops to 4, while the sunscreen coefficient of beige cotton fabric is 9, and the sunscreen coefficient of white cotton fabric can reach 33-57, but clothes made of this material may still make people with sensitive skin get sunburned. ?

The less you wear in summer, the more you can prevent heatstroke.

Walking on the road is like staying in a natural sauna in summer. Is it really cooler to travel less? ?

Many people think that the less clothes you wear, the more breathable and cooler you are. Especially beautiful women, like to show their thighs in summer, wear sleeveless clothes and have as little fabric as possible. However, this is a big misunderstanding-when the temperature approaches or exceeds the human body temperature (about 36.8℃), the bare skin is not only not cool, but even hotter. "Because shirtless can only increase the radiation and conduction heat dissipation of the skin when the skin temperature is higher than the ambient temperature." ?

Specifically, in the environment where the temperature is 18℃ to 28℃, 70% of human body temperature depends on skin radiation, convection and conduction, and when the temperature reaches 35℃, it mainly depends on skin evaporation to dissipate heat. When the temperature continues to rise, the skin not only can't dissipate heat by radiation, but also absorbs heat from the external environment, so it won't feel cool. However, the increase of body surface temperature will make people feel hotter, and being in a high temperature environment for a long time will easily lead to heatstroke. ?

It turns out that we have been living in the wrong idea and killing ourselves in summer. Scientific experiments and research are always helping us to discover and know the truth. Even in summer, there is great science in the dressing tips for heatstroke prevention and sun protection. Whether you are dissatisfied with the list of hot cities or not, I will take these summer heatstroke prevention and sun protection dressing experiments. To sum up, dark cotton should not be too exposed! ?