The noble gases, also called rare gases, include six gases: helium, neon, argon, krypton, xenon and radon. Their volume in the air is 0.94 per cent for argon, 0.0018 per cent for neon, 0.0005 per cent for helium, 0.00011 per cent for krypton, 0.000009 per cent for xenon, and radon is a gas that is radioactive. They are called rare gases because their content in the air is very minute. Under normal circumstances, rare gases are chemically inactive and do not react easily with other substances, and are also known as noble gases….
Depending on the nature of the rare gases, they are used in production and scientific research. Helium is incombustible and light enough to replace flammable hydrogen to fill high-altitude balloons and airships. Because of their chemical inactivity, rare gases are often used as protective gases in industrial production. For example, with arc welding rockets, aircraft, missiles, ships and other stainless steel, aluminium alloy materials used, you can use high-purity argon gas as a protective gas, to prevent high-temperature metal and oxygen in the air and other reactions. Commonly used incandescent light bulbs are filled with a mixture of argon and nitrogen as a protective gas to protect the filament, in order to extend the life of the bulb.
Post time: May-07-2024