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High-purity helium
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High-purity helium

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Product description
Parameters
  High-purity helium:
  Product Name: high-purity helium high, purity, helium
  Molecular formula: He
  The purity of the product is not less than 99.999
  Some other unique physical properties of high-purity helium in different environments are shown in the list below:
  Liquid density (4.20K, 100.312kPa):125.2kg/m
  Gas density (0 DEG C, 101.325kPa):0.1785kg/m
  Relative density (gas, 0 DEG C, 101.325kPa):0.138
  Specific volume (21.1 DEG C, 101.325kPa):6.0304m/kg[2] gas liquid volume ratio (15 DEG C, 100kPa):748L/L
  Critical temperature: -268.0 DEG C
  Critical pressure: 229kPa
  Critical density: 69.3kg/m
  Heat of fusion (1.2K, 2555kPa):0.0836kJ/kg
  Gasification heat (-268.926 DEG C, 101.325kPa):20.42kJ/kg
  Specific heat capacity (gas, 25 DEG C, 101.325kPa),:Cp=5238.3J/ (kg, K), Cv=3213.7J/ (kg, K)
  Heat (gas, 25 DEG C, 101.325kPa:Cp/Cv=1.63)
  Vapor pressure (0.5K):0.0000022kPa (2.0K):3.17kPa (5.0K):197.1kPa
  Viscosity (0 DEG C, 101.325kPa):0.01864mPa * S (liquid, 3.0K):0.0033mPa = S
  Surface tension (4.2K):0.096mN/m
  Thermal conductivity (0 DEG C, 101.325kPa):0.1426W/ (m * K) (liquid, 2.4K):0.01883W/ (M = K)
  Refractive index (gas, 0 DEG C, 101.325kPa):1.000035
  Applications: helium is commonly used in spacecraft or advertising balloons because of its poor chemical properties and lighter air properties. This is also well known. In the field of marine development and breathing gas mixtures, the use of superconducting electromagnet cooling and medical field magnetic resonance imaging devices, helium has been widely used in scientific research, military industry, petrochemical, refrigeration, medical, semiconductor, pipeline leak detection, superconducting experiment, metal manufacturing, deep-sea diving, high precision welding, optoelectronic products production.
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