helium
Definition of abbreviation (noun) -
first member of group V111; a noble gasPart of speech:
NounPlural: no plural
Example sentences with this word:
Helium is the second commonest element; hydrogen is the most common.
Hydrogen, helium and methane would not condense to form cloud particles at the pressures and temperatures through the cloud regions and therefore their relative abundances apply throughout the atmosphere.
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