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Definitions for Helium

[1] an inert, gaseous element present in the sun's atmosphere and in natural gas, and also occurring as a radioactive decomposition product, used as a substitute for flammable gases in dirigible balloons. Symbol : He; atomic weight : 4.0026; atomic number : 2; density: 0.1785 g/l at 0°C and 760 mm pressure.
[2] colorless liquid helium existing below its boiling point of 4.2 K and above the lambda point of 2.186 K.
[3] liquid helium existing as a superfluid below the lambda point of 2.186 K, having very low viscosity and very high thermal conductivity.
[4] a very light nonflammable colourless odourless element that is an inert gas, occurring in certain natural gases: used in balloons and in cryogenic research. Symbol: He; atomic no: 2; atomic wt: 4.002602; density: 0.1785 kg/m³; at normal pressures it is liquid down to absolute zero; melting pt: below –272.2°C; boiling pt: –268.90°C See also alpha particle

Words nearby Helium

heliozoan, helipad, heliport, heliskiing, helistop, helium, helium flash, helium i, helium ii, helix, hell

Origin of Helium

1875–80; < New Latin < Greek hḗli(os ) the sun + New Latin -ium -ium

Word origin for Helium

C19: New Latin, from helio- + -ium ; named from its having first been detected in the solar spectrum