helium
//ˈhiːliəm//
Noun
1
A colorless, odorless, inert gaseous element that is the lightest of the noble gases, used in balloons, deep-sea diving equipment, and cryogenics.
The balloon floated up because it was filled with helium.
A colorless, odorless, inert gaseous element that is the lightest of the noble gases, used in balloons, deep-sea diving equipment, and cryogenics.
The balloon floated up because it was filled with helium.