Air has a density of 0.001293 g/cm³. which of these gases would make a balloon float in air? check all that apply.

> nitrogen, density: 0.001251 g/cm³
> carbon monoxide, density: 0.001977 g/cm³
> helium, density: 0.000178 g/cm³
> carbon dioxide, density: 0.001977 g/cm³
> hydrogen, density: 0.9 g/cm³
> oxygen, density: 0.001429 g/cm³