It is not zero so the question is based on a false assumption.
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The inactive gases are the noble gases
Covection is a method of transfer of heat from one region to another. It occurs in fluids ( liquids and gases) but not in solids. It involves the actual movement of the fluid molecules in the form of kinetic energy such that as one molecule hits the other, the kinetic energy is transferred thereby transferring the heat.
Particles in gases are very far apart and there is a negligible amount of attraction force between these particles. Gas molecules have to move a long way before they interact and collide with other molecules. Sound energy slows down and does not move face when the molecules are not in contact with each other.
78% Nitrogen, 21% Oxygen, 1% trace gases
air is made up of some gases. i.e. it's made up of hydrogen, nitrogen, and mixture of other gases. but the most common is it is made up of nitrogen-78%, oxygen-21%, and other gases-1%air is made up of different gases such as oxygen, carbondioxide, nitrogen and noble gases.