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Glass has many uses. People need to use many glass products in their daily life, and they cannot be separated from glass, such as the glass door of the refrigerator. Glass is stable in nature, resistant to strong acids and alkalis, rough, hard and durable. It is one of the profiles required by some devices.

Ordinary things are opaque, why is glass transparent? The material is transparent, which means it transmits light.

First, most substances, even if they are highly absorbent, can be transparent as long as they are thin enough, such as single-layer graphene. For most metals, the energy level gap between very high occupied orbitals and very low unoccupied orbitals is zero, so it has excellent absorption ability for most light.

After absorbing the light, the excited photoelectrons jump back and emit light at a different wavelength, and the metal appears to have a different color.

However, due to the good absorption of light, the transmittance is low, and the light cannot penetrate, resulting in opacity of the metal. In the case of glass, because there is an energy level difference between the very high occupied track and the very low unoccupied track, only photons with sufficient energy to cross this barrier are absorbed.

Thus, photons are poorly absorbed in the infrared and visible range. This part of the light penetrates the material well, so the glass is transparent, but the glass is very UV-absorbing.

The transparency and opacity of matter are also related to other causes, such as the scattering and reflection of photons in atoms.

Even if photons are not absorbed, they can be reflected, which also results in poor transmission. There are many defects in crystals, and perhaps the refractive index changes caused by phase transitions can also make the original transparent material opaque. After listening to the editor's explanation, are you white?