The hot summer is here. You must have heard that wearing light-colored clothes in summer is cooler than wearing dark-colored clothes, because white does not absorb heat, while black does.
Most people will think this statement is correct. Wearing light-colored clothes in summer can achieve a cooling effect. Looking around on the street, there are not as many people wearing dark clothes as there are in winter.
Is this really the case? Is it wrong to wear light-colored clothes for so many years just to keep cool in summer? You must not be the first one to be fooled.
In order to find the truth, we conduct these two experiments.
Experiment 1: At 12 o’clock at noon when the sun is shining brightly, hang three pieces of clothing on the clothesline and put a thermometer on each piece of clothing.
Five minutes later, the thermometers on the red and black clothes showed that the temperature had exceeded 40°C, while the thermometer on the white clothes showed a temperature of 38.7°C. Does this time just confirm the view that wearing white clothes is cooler than black clothes in summer? Don’t worry, let’s continue the experiment. Experiment 2
When the outdoor temperature is about 32°C, lay the clothes flat on the straw mat and expose them to the sun for 20 minutes.
As a result, the thermometer on the red clothes showed the lowest number, 36.5℃. The thermometers on white and black clothes showed numbers of 37.1℃ and 36.9℃ respectively.
Is it cooler to wear light-colored clothes in summer?
According to the above experimental results, it is found that white clothes are the coolest when exposed to the sun for a short period of time, while red clothes are cooler when exposed to the sun for a long time. Therefore, if you are walking around outside for a short period of time, of course, light-colored clothes will be cooler.
Black clothes absorb more heat than white clothes. The absorbed heat can form a convection force in the clothes, taking away sweat and part of the heat from the skin surface. The human body will naturally feel cooler. Of course, black Clothes should be looser, which can strengthen the “convection” and increase the coolness of the clothes.
In addition, if you wear black clothes indoors or on cloudy days, when there is less sunlight, black will not exert its ability to absorb heat quickly. Instead, it will only exert its ability to dissipate heat quickly and quickly drain away heat from the skin surface. The heat makes the body feel much cooler, and it naturally feels cooler than clothes of other colors.
White clothes have poor ability to absorb ultraviolet rays, and red light has the longest wavelength and violet light has the shortest wavelength. Red-colored clothes can absorb a large amount of ultraviolet rays in sunlight.
So if you are in the sun for a long time, wearing red clothes will not only keep you cooler, but may also provide some sun protection.
The less you wear in summer, the better you can prevent heatstroke?
Many people think that wearing sleeveless or tank tops will keep you cooler in the summer. Many men like to go shirtless because they think this will keep them cooler.
In fact, the less you wear in summer, the better you can prevent heatstroke. Only when the skin temperature is higher than the ambient temperature, the skin can conduct heat dissipation. When the temperature is close to or exceeds the human body temperature, the skin not only cannot Through heat dissipation through conduction, it will also absorb heat from the external environment, making it easier to cause heatstroke.
What kind of fabric is cooler?
Many people believe that seemingly light and cool materials such as chiffon shirts and quick-drying clothes, which make the human body feel cool and comfortable, are cooler.
However, the human body sweats a lot in summer. Although chemical fiber fabrics are relatively light and thin, they have poor water absorption and air permeability. It is difficult for the skin to dissipate heat through sweat evaporation. Excessive sweat retention will cause skin secretions to become corrupt and fermented. , in addition, synthetic fibers are mixed with chemical components such as monomeric ammonia and methanol during the production process, which can cause great irritation to the skin and easily induce allergies and dermatitis.
In contrast, natural fibers such as cotton, linen, and silk are the first choice for hot weather.
Silk has good skin-friendly properties, is thinner and feels cooler when worn.
Cotton clothing absorbs sweat and has good breathability.
Linen material has large pores and good air permeability and water absorption.
At the same time, the “sun protection value” of clothes is not only related to the color, but also to the material of the clothes. The sun protection value of cotton clothes is 15 to 40, the sun protection value of light-colored polyester fiber clothes is 7 to 10, and the sun protection value of light-colored knitted clothes is 4 to 9.
If you want to protect yourself from UV rays, your best choice should be red cotton clothes.
Therefore, the cool fabrics for clothing must meet the performance requirements.�Quickly absorbs and evaporates sweat on the surface of human skin and takes away the heat on the skin surface. Therefore, it is necessary to absorb sweat and quickly evaporate sweat. Only in this way can you wear cool clothes.
In summary, the real answer to this question is:
In hot weather, it doesn’t make much of a difference whether you wear dark or light clothing. The key is to wear loose-fitting clothes. If they are tight, then any color will make you feel hotter!
