Views: 1 Author: Site Editor Publish Time: 2022-02-14 Origin: Site
There is such a class of gases, which are very inert in the atmosphere and difficult to react with other substances to form compounds. They are called noble gases, also known as noble gases. Next we will introduce the least rare of the rare gases, argon (Ar). Argon is colorless and odorless. It cannot burn itself or support combustion. Its content in the atmosphere is second only to nitrogen and oxygen, and higher than that of carbon dioxide. The application of argon is very extensive, and it is found in our daily life. Due to its chemical inactivity and poor thermal conductivity, one of the most widespread uses is as a filling gas in lighting technology. Filling the bulb with argon extends the life of the filament. In addition, in the energized state, argon can emit blue-violet light, so people often fill light bulbs with argon and several other gases that can emit colors to make neon lights. In addition to lamps, some window glass is also filled with argon. The windows of some buildings are equipped with insulating glass, and a gas barrier with good thermal insulation performance is inserted between the glass, which is filled with argon gas, which can isolate some external heat, thereby greatly reducing the thermal conductivity of the windows. This method has now been widely used in the manufacture of insulating layer materials for high-grade insulating glass.
In industrial production, argon is often used as a shielding gas for welding or cutting metals: First, in the welding process, due to the small heat capacity and thermal conductivity of argon, the loss of arc heat in argon is very small. In an argon atmosphere, the arc cools very slowly, so the stability of the arc combustion is better, can be maintained at a high level, and can complete the welding efficiently. Second, since the ionization potential of argon is relatively low, the arc voltage required for welding is also relatively low. In this way, we can use less energy to weld the same number of parts, thereby saving energy. Again, argon is relatively dense, about 1.4 times denser than air. After the argon gas is ejected from the nozzle, a stable gas flow layer can be formed. In addition, argon is denser than air and is not easily dispersed by air, so it can stably cover the metal surface and play a good protective role.
Argon also has applications in medicine, such as argon knives. The full name of argon knife is argon plasma coagulation. This treatment method uses argon to be ionized under the action of high-frequency current. The argon plasma generated after ionization is conductive and can guide the current from the high-frequency output electrode to the tissue. This method can not only avoid direct contact between electrodes and tissue, but also ensure that the current can flexibly enter every corner of the tissue. After the high-frequency current contacts the tissue, the tissue will be inactivated and coagulated by thermal effects. When treating tumors, doctors will choose argon knife as a treatment method according to the specific situation. As a noble gas, the use of argon is not rare. Although invisible and intangible, the various properties of argon have brought us a lot of convenience.