Helium is a rare gas, chemical formula He, is a colorless, odorless inert gas, chemical properties are inert, it is difficult to react with other substances under normal conditions.
1, helium can be used as a booster and pressurizer for rocket liquid fuel, and has a wide range of applications in missiles, spacecraft and supersonic aircraft.
2, helium is used as a protective gas in smelting and welding, and is very important in ship manufacturing and aircraft, spacecraft, rockets, and weapons manufacturing.
3, helium has excellent permeability, used for nuclear reactor cooling, rockets, nuclear reactor some pipes and electronic and electrical equipment leak detection.
4, helium is a gas with ideal gas properties, is an ideal gas for vapor pressure thermometers at very low temperatures.
5, the mass density and weight density of helium are very small, non-flammable. It can be used to fill light bulbs, neon tubes, and is an ideal gas for balloons and airships.
6, Liquid helium can be obtained at low temperatures near absolute temperature (-273 ° C) for the manufacture of superconducting equipment.
7, helium is an inert gas, the solubility in the blood is lower than nitrogen, so its anesthetic effect is lower than nitrogen, so helium is often mixed with oxygen, as a breathing gas for divers.