The difference of densities at 15 0C and 1,013 bar, between air and carbon monoxide is very small;
Air - 1,202 g/L; Carbon monoxide (CO) - 1,184 g/L
damp air
A football with full air is heavier.
Cooler air is more dense than warmer air, that means that for a unit of volume cooler air will be heavier.
no because helium is a gas and it floats so obviously it is not heavier
Yes, it is heavier than air.