Anything with mass has weight; air has mass, therefore it has weight.
The weight of the air on the earth is called... Air Pressure
The three properties of air are weight, mass, and density.
air has weight
a person feeling the weight of air feels
air pressure
No
The compression of air.
The weight of air is called air pressure. There is no way around air pressure and it must be calculated into anything having to do with physics.
Take a large container, pump out all the air from inside it. Weigh it. Put air inside and then weigh it again. The difference would be the weight of the air inside. Air molecules have mass (air is "stuff") and things with mass have weight when in a gravitational field, such as on Earth. If air didn't have any weight, we wouldn't even have an atmosphere.
The weight of air is generally referred to as air pressure (about 14.7 psi). This is the weight oa coulmn of air extending from the surface to the upper limits of the atmosphere for each square inch of surface.
Get all the air out of it, and weight it. This is the true weight of just the vacuum chamber.
The average molecular weight of dry air is 28.96 g/gmol.