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      Helium-He

      serial:Helium-He

      summary

      Name:Helium Chemical common name:氦氣 Formula:He Categories:Rare gases Subclasses:Rare gases Specifications:40L: Storage methods:

      Description

      As He called Helium, Helium, English symbols, colorless, tasteless, not flammable, the content is about 5.2 parts per million in the air.Chemically inert, condition not usually combined with other elements or compounds.On July 10, 1908, the Dutch physicist, nice liquefied helium gas for the first time.
      Chinese name helium
      English name Helium
      Chemical formula He
      The molecular weight of 4.003
      The CAS login number 275-187-7
      Melting point of 1.0 K (1.0 MPa)
      Boiling point 4.3 K (4.3 MPa)
      Water soluble poorly soluble in water
      Dense degree of 0.1786 g/L (0 ° C and 0.1 MPa)
      Outside view colorless
      Safety description is flammable
      Contain the amount of content in the air which is about 5.2 parts per million
      Types of rare gas
      Critical temperature 5.19 K
      Critical pressure is 0.228 MPa
      Evaporation heat 20.4 kJ/kg (boiling point)

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