원자 번호 2번의 화학 원소로, 비활성 기체 중 가장 가벼운 기체.
The chemical element of atomic number 2, an inert gas which is the lightest member of the noble gas series.
예문:
"Balloons filled with helium float in the air because the gas is less dense than oxygen."
"Liquid helium is used as a coolant for superconducting magnets in MRI machines."
"Helium is the second most abundant element in the observable universe."