HELIUM CAS# 7440-59-7

Helium, is a rare gas, the chemical formula is He, is a colorless and odorless inert gas, chemical properties are not active, in general it is difficult to react with other substances.1. Helium can be used as a pressure transmitter and supercharger for rocket liquid fuel, and is used in missiles, spacecraft and supersonic plane.
2, helium is used as a protective gas in smelting and welding, which is very important in shipbuilding and the manufacture of plane, spacecraft, rockets and weapons.
3, helium has excellent permeability, [2] for the cooling of nuclear reactors, some pipelines and electronic and electrical devices of rockets and nuclear reactors leak detection.
4. Helium is a gas with ideal gas properties, and is the ideal gas for vapor pressure thermometers at very low temperatures.
5, helium mass density, weight density are low, and non-flammable, can be used to fill bulbs, neon tubes, but also the ideal balloon and airship gas.
6, liquid helium can get a low temperature close to the absolute temperature (-273 °C), used in the manufacture of superconducting equipment.
7, helium inert gas, the solubility in the blood is lower than nitrogen, so its anestheticity is lower than nitrogen, so helium is often mixed with oxygen as a diver’s breathing gas.