Can ultraviolet rays pass through opaque glass?

Ultraviolet rays cannot penetrate ordinary glassAnd ultraviolet rays can pass through quartz glass. Ultraviolet light has poor penetration and can be affected by dust particles and humidity. If there are many dust particles in the air, the sterilization efficiency will be reduced; As the relative humidity increases, the sterilization efficiency decreases.

Ultraviolet light is a low-energy electromagnetic radiation with a wavelength range of 240 280 nm and an optimal wavelength of 260 nm, which is consistent with the DNA absorption spectral range. Its bactericidal principle is that ultraviolet rays are easily absorbed by nuclear proteins, so that the adjacent bases on the same spirochete of DNA form thymine dimer, thereby drying up the replication of DNA, resulting in bacterial death or mutation.

Sunlight contains a lot of ultraviolet rays, but it can't penetrate the glass panes of the windows and enter the room. In the electromagnetic spectrum, radio waves, infrared, visible light, Roentgen rays, and rays can all pass through the glass plate, but they do so in different ways.

Ultraviolet rays can penetrate glass, but the intensity of ultraviolet rays is greatly reduced after penetrating the glass.

UV-resistant glass is called UV-resistant glass, which can also be called or filtered UV glass. This glass can filter ultraviolet light, and although ultraviolet light has the effect of sterilization and disinfection, it must be avoided in some places, such as office buildings, furniture, libraries and other places.

Precautions for choosing glass

1. When buying glass, we must take into account its safety, many glass on the market do not have a brand, this kind of glass is best not to buy, only the quality of regular glass is ***, usually there will be a logo on the regular glass, if not, it means that the safety performance of this glass does not meet the standard, and there may be safety accidents after use.

2. When buying glass, you should also see the hardware it matches, to ensure excellent quality, you can touch your hands to see whether the accessories are firm, whether the outer layer is rough, if the outer layer is rough, do not buy.

Ultraviolet rays cannot pass through ordinary glass, while ultraviolet rays can pass through quartz glass. So the ultraviolet lamp is made of quartz tube material. When we produce ultraviolet tubes, we use flat glass as protection to block the ultraviolet rays generated during the production process from harming workers.

Although ultraviolet light has a germicidal effect, its penetration of glass is very poor. A layer of two millimeters of glass is enough to block 80 percent of ultraviolet rays; If it is two layers of glass, the UV rays are completely blocked. So, if you bask in the sun in the house in winter or early spring, thinking that this can also kill bacteria, it is wrong.

Whether it's a harsh winter or a hot summer, you should stick to getting outside in the sun. In this way, you can not only exercise your body, but also prevent various epidemic infectious diseases.

Glass blocks out ultraviolet radiation.

If you don't believe me, you can do a test, basking in the sun through the glass will not tan your body.

Frosted glass only produces diffuse reflection, and sunlight is not easy to enter the room, while ordinary glass will bring sunlight into the room.

We know that sunlight contains a lot of ultraviolet rays, but it can't pass through the glass plate on the window and enter the room In the electromagnetic spectrum, radio waves, infrared, visible light, Roentgen rays, rays can all pass through the glass plate, but they penetrate in different ways Radio waves, infrared, their volatility is strong, visible light fluctuations and particles are relatively strong, these electromagnetic waves, mainly through diffraction and refraction and propagation And Roentgen rays, rays, they have strong particles, large particle energy, It has a strong ability to penetrate, therefore, these electromagnetic waves can directly penetrate the glass plate The wave of ultraviolet rays is not significant, and the particle property is stronger than that of visible light, but the energy of ultraviolet particles (about tens to hundreds of electron volts) is not enough to penetrate the glass plate, so ultraviolet rays cannot penetrate the glass plate

Most ultraviolet rays are impermeable to glass. When basking in the sun through the glass, ** can not receive ultraviolet radiation, or only a very small amount of ultraviolet rays, can not promote the synthesis of vitamin D, due to the ultraviolet actinization in the sun, can promote the production of vitamin D3.

Characteristics of ultraviolet lightUltraviolet rays can not pass through the glass, through the glass sun, blocking a large number of ultraviolet rays, will affect the synthesis of vitamin D3, the infrared rays in the sunlight can pass through the glass, continue to produce heat through the glass sun can play a role in heating, infrared is one of the many invisible rays in the sun's rays.

Discovered by the British scientist Herschel in 1800, also known as infrared heat radiation heat is very strong, German physicist Ritter was very interested in this discovery, he firmly believed that physics has a bipolar symmetry, and believed that since there is invisible radiation outside the red end of the visible spectrum, then invisible radiation must also be found outside the violet end of the visible spectrum.

The ultraviolet bond should not be able to pass through the transparent glass, and the iron ions in the glass are the main source of ultraviolet absorption. As long as the glass contains iron, it can absorb more than 90% of ultraviolet rays (of course, it is also related to thickness).If you want UV rays to penetrate the glass, you need to minimize the iron content in the glass (the glass raw material pickles to remove iron) or use a glass with a thinner thickness.

Factors influencing UV penetration of unbright groups include:

1. The penetration of ultraviolet blight line is poor, which can be affected by dust particles and humidity. If there are many dust particles in the air, the sterilization efficiency will be reduced, and the relative humidity will increase, and the sterilization efficiency will also be reduced.

2. The penetration power of ultraviolet rays in the liquid can be reduced with the increase of the high level of the liquid, and the impurities in the water have a greater impact on the penetrating power, and the dissolved salts, sugars and various agricultural production systems can reduce the penetration of ultraviolet rays.

3. The penetration of solid substances, some objects that visible light can pass through, ultraviolet rays cannot be transmitted, such as glass, window paper, PVC film, dust, etc., can block the penetration of ultraviolet rays, and affect the <> of its sterilization effect

First, under normal circumstances, ultraviolet rays can not penetrate the glass, and most of the current ultraviolet lamps are made of quartz materials, as long as they are not macro-made to directly irradiate people or look at ultraviolet light, there will be no harm.

2. Songxian ultraviolet lamp is a device that can emit ultraviolet rays, which is a necessary tool to observe the fluorescence and phosphorescence characteristics of samples, and is also a physical means for sterilization and disinfection. The wavelength is in the range of 10 400nm.

3. Ultraviolet rays are a kind of low-energy electromagnetic waves, which are widely used in medical treatment, health and epidemic prevention, food industry, pharmaceutical industry and other departments because of their good bactericidal effect.

4. Electromagnetism, one of the physical concepts, is a general term for the electrical and magnetic properties of matter. Such as electromagnetic induction, electromagnetic waves and so on. The electromagnetic phenomenon was first discovered by Faraday.

The cause of electromagnetic phenomena is that the movement of electric charges produces fluctuations and forms a magnetic field, so all electromagnetic phenomena are inseparable from magnetic fields.