Oxygen, honestly come on people.
Nitrogen gas naturally makes up around 78% of the air we breath.
Which gas is air mostly made up from
Carbon Dioxide
This is the gas carbon dioxide.
Hydrogen is the lightest gas found in air.
Air is a gas, made up of a mixture of different gases like nitrogen, oxygen, carbon dioxide, and others. While solids like dust particles and liquid water droplets can be found within the air, the air itself is considered a gas.
hydrogen
Argon is another gas found in air, making up about 0.93% of the Earth's atmosphere.
The primary gas found in air is nitrogen, which makes up about 78% of the Earth's atmosphere. Oxygen is the second most abundant gas, comprising about 21% of the air we breathe.
CO2 a.k.a Carbon Dioxide
Pure helium is made of elemental helium only and is a gas at STP. It will not have air.
Carbon Dioxide is the gas that helps plants grow. As does nitrogen and it it the major consituent of the atmosphere