Leaving the air-conditioned room in this fire-like summer is a big thing. Of course, in order to get a meal or have to go out, then go out to wear what clothes to cool down some? I believe it is generally believed that wearing white in summer is much cooler than wearing black.
This statement is based on what is mentioned in junior high school physics, the color of the object is because of what color of light the object reflects, white theory can reflect all wavelengths (colors) of light in the spectrum, and black theoretically absorbs all wavelengths (colors) of light in the spectrum. So black absorbs more heat than white. So, is white really cooler than black? Is that really the case?
Is white really cooler?
On the question of which black and white clothes are cooler, decades ago, scientists from the Department of Zoology at Tel Aviv University in Israel were puzzled as to why Bedouins in the Sinai Peninsula, who live in the desert, prefer to wear black robes rather than white robes like they do. So they brought in volunteers who, in turn, wore the same black and white robes in the desert at temperatures of 35-46 degrees Celsius, and measured the heat gained and lost in 30 minutes.
The results, published in the 1980 journal Nature, are clear, and while black robes do absorb more calories, the extra heat dissipates before they reach the skin. In the same temperature, whether wearing a black robe or a white robe, the heat that eventually reaches the skin is the same.
It is worth mentioning that although white clothes and black clothes, long exposure to the hot sun, the two are not cooler, but in a short period of time, there are some differences. As we’ve said before, because black absorbs more heat, which means that black clothes heat up faster than white. So white clothes are actually cooler than black shorter when exposed to the sun is shorter.
However, when we discuss which cooler white and black clothes are, we often forget that UV rays are the most harmful. Studies have shown that different colors of clothing against uv rays are different, the worst sun protection is light yellow cotton fabric, its sun protection coefficient is only 7. In addition, the sun protection coefficient of beige cotton fabric is 9. Overall, the dark color system’s sun protection effect is better than the light color system, the best sun protection is red, followed by Tibetan cyan, black.
In general, white clothes are not as cool as black clothes, but are more likely to be tanned.
Fabric is the most important thing.
Clothes wearing cool not cool, and the relationship with the color of clothes is actually relatively small, the real impact of clothes wearing cool is the material of the clothes.
In hot places, our bodies constantly sweat outwards, through the evaporation of sweat, to achieve the role of cooling and regulating body temperature. So to be cooler, clothes must be more absorbent and breathable. Different materials of clothing absorbability and breathability are also different.
Among them, silk is the most suitable for summer wear, silk is light, breathable, very skin-friendly. Moreover, silk absorbs ultraviolet light to protect our skin. And cotton clothing moisture absorption and breathability performance is also very good, linen clothing because of the pores, breathability and absorbent is also better, wear it is also relatively cool.
However, some people will certainly say, don’t wear the coldest. In fact, it is really not clothes through less cool. The heat transfer between objects is from high temperature to low temperature, and the human body is the same, only when the body’s surface temperature is higher than the outside world, the skin can dissipate heat, on the contrary, if the temperature reaches or exceeds the body temperature, the skin can not actively dissipate heat, on the contrary, the skin will absorb heat from the outside, let the body temperature rise, become more susceptible to heat stroke. That’s why people in extremely hot areas such as the deep deserts also wear long clothes in summer to wrap themselves in tight.