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Helium (He)

Helium is a noble gas found in small amounts in the atmosphere, less than 0.001% in air.

 

It has the lowest boiling point and the lowest melting point of the chemical elements and occurs only in the gaseous state outside of extreme conditions.

Details about Helium: 

  • Symbol: He
  • Purity: ≥99.99%
  • Atomic number: 2
  • It is an inert, colorless, odorless, tasteless monatomic gas
  • In the gas phase it has the highest thermal conductivity after hydrogen
  • It is slightly soluble in water

Helium is used in:

  • For cooling uranium rods in nuclear reactors
  • Balloons and airships are often inflated with helium because it is lighter than air
  • For metal processing, as an inert protective gas for arc welding
  • For cooling superconducting magnets
  • For leak detection
  • Mixed with a heavier gas, such as xenon, is useful for thermoacoustic refrigeration
  • At low temperatures it is used in cryogenics
  • For gas chromatography
  • As a transport gas for oxygen, for diving at great depths
  • For MRI magnetic resonance scans