Dress up | What color of fabric is the most sunscreen in summer?
Guess who wears the coolest skirt among the three of them? It is said on the Internet that dark clothes absorb heat, which is definitely the coolest way to wear white clothes, but is that so? Let's look at an experiment!
At 12 noon when the sun is strong, hang three clothes on the clothesline and put a thermometer on each clothes.
Five minutes later, the thermometer on the red and black clothes showed that the temperature had exceeded 40 degrees C, while the thermometer on the white clothes showed that the temperature was 38.7 degrees C.
When the outdoor temperature is about 32 degrees Celsius, spread the clothes on the grass mat and sun for 20 minutes.
The result shows that the thermometer on the red clothes shows the lowest number, 36.5 C. The thermometers for white and black clothes show 37.1 and 36.9 degrees respectively.
According to the experimental results, it is found that white clothes are coolest in a short time and red clothes are cooler in a long time.
For a long time, it is easy to take for granted that dark clothes absorb heat quickly, while white clothes absorb heat slowly, so in a short time, light clothes will be cooler.
Light-colored clothes can reflect part of the ultraviolet light, but the ability to absorb ultraviolet light is not good, and red light has a longer wavelength, which can absorb a large amount of ultraviolet light in the sun, so if it is in the sun for a long time, it will be cooler to wear red clothes.
It's not that the less you travel, the more you can prevent summer heat.
Many people think that sleeveless and sling shirts will be cooler in summer. Many men like to wear naked shirts, so they feel cool. In fact, the less you travel in summer, the more you can prevent heat. Only when the skin temperature is higher than the ambient temperature, can the skin conduct heat dissipation. When the temperature is close to or higher than the human body temperature, the skin not only can not transmit heat, but also can absorb heat from the external environment, which is more likely to lead to heatstroke.
Dark clothes are cooler
An experiment at Harvard University in the United States has shown that wearing dark clothes in summer is cooler than wearing white clothes. Black clothes absorb more heat than white clothes. The heat absorbed can form convective power in the clothes. If sweat and part of the heat on the skin surface are taken away, the human body will naturally feel cool. Of course, black clothes should be looser, so as to strengthen the convection and increase the degree of cool clothes.
In addition, wear black clothes indoors or on cloudy days, when the sunshine is less, black will not play the nature of fast heat absorption, but only play its ability to dissipate heat quickly, quickly drain the heat from the skin surface, make people feel much cooler, naturally feel cooler than other colors of clothes.
Chiffon skirts and quick-drying clothes that seem light are not cool
Chiffon skirts, Chiffon shirts, quick-drying clothes... This seemingly light and cool material is not "cool" at all. In summer, the human body sweats a lot. Although the chemical fiber fabric is light and thin, it has poor water absorption and air permeability. It is difficult for the skin to dissipate heat through sweat evaporation. Excessive perspiration will cause skin secretions to rot and ferment. In addition, synthetic fibers are mixed with monomer ammonia, methanol and other chemical ingredients in the production process, which will stimulate the skin greatly and easily induce allergies and dermatitis.
In contrast, natural fibers such as cotton, linen and silk are preferred in high temperature days. Silk has good skin affinity, lighter weight and cool body. Cotton clothing absorbs sweat and has good air permeability. Flax material has large porosity, good air permeability and water absorption.
The "sunscreen value" of clothes is not only related to color.
The anti-ultraviolet effect of clothes depends not only on color, but also on the material of clothes. The sun protection values of cotton clothes are 15-40, light polyester clothes are 7-10 and light knitted clothes are 4-9. If you want to prevent ultraviolet rays, you'd better wear dark cotton clothes.