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Helium Definition
Helium is a colourless and odourless non-flammable gaseous element which is present in natural gas. Helium is mainly used as a lifting gas in balloons, refrigerant, superfluid in cryogenic research and as a substitute for flammable gases in dirigibles.
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Definition List
Heisey Heintz Art Heighten Heian Hedi Schoop Helium Helix Hellenistic Hemisphere Heptagon Heptahedron
Heisey Heintz Art Heighten Heian Hedi Schoop Helium Helix Hellenistic Hemisphere Heptagon Heptahedron