As we all know, sunbathing is very good for our body, but many people, especially girls, want to bask in the sun but are afraid of sunbathing, so many people choose to hide in the window to bask in the sun. sun. So, will you tan if you are exposed to the sun through a window? Can glass block UV rays? Will I still get a tan while sunbathing through a window?
1. Will I tan if I tan through the window?
(1) Will I tan if I tan through the window?
p>Clear glass will be tanned. The ability of ordinary glass to block ultraviolet rays is very poor. It only reflects part of the ultraviolet rays, especially transparent glass can only delay tanning. It should be noted that even if only a small amount of ultraviolet rays are reflected by the glass oIf you use mirrors, you will get sunburn over time. However, if you are exposed to sunlight through glass, the intensity of ultraviolet rays will be weakened, and you. will generally not get sunburned.2. Special glass will not cause tanning
Some glasses are specially made, black or dark blue in color, and have a strong UV protection function. more than 99% of ultraviolet rays will be reflected, so you don't have to worry about tanning through such glass.
(1) Should I use sunscreen when tanning through a window?
Yes. Even if the sun does not shine directly through the glass onto the skin, some ultraviolet rays will be refracted onto the skin. If you don't want to tan, when the sun is strong in summer, you should also apply sunscreen with one. sun protection factor SPF15++ or higher through the glass. Sexcept for UV resistant glass, of course.
(2) What are the disadvantages of basking in the sun through glass?
Glass can indeed block the sun's UV rays, but it cannot. resist 50% Long-wave ultraviolet rays enter the room, and it is these ultraviolet rays that accelerate skin aging.
Regular exposure to UV rays means skin ages twice as fast as when it is protected, leading dermatologists and photobiologists warn. Your face will have more folds and wrinkles around the eyes, nose and mouth, which will be much deeper.
(3) What to watch out for
No more than 20 minutes
Exposure to the sun promotes synthesis of vitamin D and is beneficial for the absorption of calcium by the body. Quality is useful to some extent, so we need from time to times to replenish calcium. But be careful not to exceed 20 minutes, especially in summer, otherwise it could harm the skin if it is too long.
The best time to tan is between 8 a.m. and 9 a.m.
Infrared rays have the upper hand during this period, the intensity of ultraviolet rays is low, the skin will not be burned by the sun, and it can promote blood circulation and make people feel messy.
2. Is it useful to bask in the sun through a glass?
(1) Is it useful to bask in the sun through a glass to stock up on calcium ?
Calcium supplementation is not effective. In summer, many people want to bask in the sun to promote calcium absorption, but worry that direct exposure will cause sunburn. Therefore, they want to bask in the sun through a glass. However, this approach does notis not effective in promoting calcium absorption. and can cause sunburn.
Glass blocks part of UVB, and the synthesis of vitamin D by sunlight relies on UVB (UVB irradiation can promote the conversion of 7-dehydrocholesterol in the skin into cholecalciferol, which is endogenous vitamin D3), therefore it promotes better absorption of calcium in case of direct contact.
(2) When is the best time to sunbathe?
Exposing to the sun can accelerate blood circulation in the skin and internal organs and improve hematopoietic function. . It is very useful in the prevention and treatment of rickets in children and osteoporosis in adults. There are two times of day that are best for basking in the sun.
First of all, from 6:00 a.m. to 10:00 a.m.
At this time, infrared rays predominate and ultra raysaviolets are weak, which makes people feel warm and soft, and can promote blood circulation and eliminate blood. stasis.
Second, from 4 p.m. to 5 p.m.
At this time, the ultraviolet ray beam has the upper hand, which can promote the absorption of calcium and phosphorus in the intestines. , which is beneficial for strengthening the body. Promotes normal bone calcification.
(3) How long should you bask in the sun at a time?
The time you spend in the sun should be determined based on intensity. ultraviolet rays from the sun in different seasons. If the time is too long, the skin may become sunburned or the brain may be deprived of oxygen or feel dizzy.
Summer: 20 minutes, no more than half an hour;
Spring and autumn: 30 minutes;
Winter: 30-40 minutes;< /p >
(4) What to watch out for
1. After sunbathing, you should drink more water and eat more fruits and vegetables to supplement enough vitamin C. This can inhibit the formation of melanin to prevent sun spots.
2. Go outside to bask in the sun, do not bask in the sun through a glass window indoors, as this will not be effective for calcium supplementation.
Can we connect the design of glass windows to the use of solar energy?
Behind high transparency lies the most advanced nanometer and photovoltaic technology in the world . The photovoltaic glass of Jinmao Green Building appears thin, but actually contains a multi-layer glass structure. Coatings and films made of special nanoparticle materials are attached between the structures. When sunlight shines on a window, "visible light" reaches the room through the glass to provide brightness.anger. “Infrared rays” reach the window edge through the adsorption and conduction of special films. “Ultraviolet rays” are converted into infrared rays. special materials then transmitted. The window edges are distributed. Solar cells, after receiving light energy, begin to produce electricity. So don't underestimate this piece of glass, it is currently the world's leading technology.
Does the sun shine when the windows are closed in summer?
Basically, many people have thought about the idea you mentioned
< p>But, I really want to change this. It seems a bit unlikely.Assuming such a design, certain conditions must be met:
1. The mirrored surface of the window. The outer surface should be shiny and as you said the slope and curvature should be ensured, and that's only for a specific directionincident light. Does the sunlight angle change every day? Do you have to change your angle every moment to open a window?
2. Opening and closing windows. To achieve the reflection effect, do you assume that it will be reflected when the windows are open, or that it will be reflected without opening the windows? Unless it's an office building, windows can't be opened, just like a mirror. But now they are all residential areas, and there are not many residential houses next to office buildings.
3. I majored in mechanics and I can tell you clearly that even if a window like that could be designed, it would be difficult to manufacture and the cost of processing curved surfaces is much higher than flat surfaces. Who would buy a piece. of glass that costs thousands of dollars?
4. The starting point is good, it can solve the ec problemsairing and heating. But we have no choice as to the intensity of the light, which will inevitably result in too strong a reflection and a dazzling effect. In addition, if this happens, it can have a good lighting effect on the opposite building, but the street can become a bright place. Light pollution in cities is already very serious today...
This idea is therefore not currently feasible. Perhaps with technological advancements in the future, this will become a reality. Just like the protective umbrellas of the two spaceships in "Solar Catastrophe".
I also hope that when that day comes, we can use the internet and technology to our benefit.
You can't replenish calcium by basking in the sun through a glass. The role of sunbathing is not to directly replenish calcium, but to expose the baby's skin to ultraviolet rays, which convert cholesteroll present in the oil on the surface of the baby's skin in vitamin D3. Vitamin D3 can promote the baby's absorption of calcium. Glass effectively blocks ultraviolet rays, so vitamin D3 cannot be synthesized when exposed to sunlight through glass.