helium
US /ˈhiː.li.əm/
UK /ˈhiː.li.əm/
名詞
氦
the chemical element of atomic number 2, a light, colorless, inert gaseous element. It is the second lightest element in the universe.
範例:
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Balloons filled with helium float because it is lighter than air.
充滿氦氣的氣球會漂浮，因為它比空氣輕。
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Liquid helium is used in cryogenics.
液態氦用於低溫學。