helium
0 antonyms and opposites of helium.
Noun — A colorless, odorless, chemically inert gas, the second-lightest element, used to fill balloons and cool superconducting equipment.
0 antonyms and opposites of helium.
Noun — A colorless, odorless, chemically inert gas, the second-lightest element, used to fill balloons and cool superconducting equipment.