Helium
Helium is the second lightest elemental gas after hydrogen: The smallest of all molecules, it has the lowest boiling point of any element.
Helium occurs in the atmosphere in a concentration of approximately five parts per million. Because of the low concentration, commercial extraction from the air is impractical.
He
Chemical formula
4.003
Molecular weight
-268,93
Boiling Point
0.138
Relative density (air = 1)
Technical Properties
Product: helium
Chemical formula: He
Purity level: ≥ 99.998%
Relative density (air = 1): 0.138
Aspect: colourless gas
Odour: odourless gas
Limit of flammability in air: not flammable
Other properties: nontoxic, chemically inert, only slightly soluble in water, high thermal conductivity (five times more than water). It does not become radioactive under irradiation; it remains liquid down to essentially absolute zero so that it is the coldest known substance.
Chemical formula: He
Purity level: ≥ 99.998%
Relative density (air = 1): 0.138
Aspect: colourless gas
Odour: odourless gas
Limit of flammability in air: not flammable
Other properties: nontoxic, chemically inert, only slightly soluble in water, high thermal conductivity (five times more than water). It does not become radioactive under irradiation; it remains liquid down to essentially absolute zero so that it is the coldest known substance.
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Safety Data Sheets
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