Definition of helium in English:
- Other light elements that are commonly proposed for the outer core are silicon, carbon, helium, and nitrogen.
- Ramsay realized that argon and helium might be members of a hitherto unsuspected new group in the Periodic Table.
- Cool the detectors with liquid nitrogen instead of solid hydrogen or liquid helium.
Helium occurs in traces in air, and more abundantly in natural gas deposits. It is used as a lifting gas for balloons and airships, and liquid helium (boiling point: 4.2 kelvins, −268.9°C) is used as a coolant. Helium is produced in stars as the main product of the thermonuclear fusion of hydrogen, and is the second most abundant element in the universe after hydrogen
Definition of helium in:
- US English dictionary
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