noble gas
The quality of being recallable.
A day on which a festival, religious event, or national celebration is traditionally observed. / A day declared free from work by the state or government.
(chemistry) Any of the elements of group 18 of the periodic table, being monatomic and (with very limited exceptions) inert.
(rare) 6th; Abbreviation of sixth.
ヘリウムは希ガスの一種で、空気よりも軽く反応性が低いため、気象用の気球を膨らませるのに一般的に使われます。
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