air has weight
Air has weight because it is made up of molecules that have mass. The weight of the air is due to the gravitational force pulling down on these molecules. The more air molecules present in a given volume, the greater the weight of the air.
The weight of air is called atmospheric pressure. It is the force exerted by the weight of the air above a given point in the atmosphere.
The three properties of air are weight, mass, and density.
The weight of air on Earth is called atmospheric pressure. It is the force exerted by the weight of air molecules in the Earth's atmosphere on a surface.
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.
A balloon has a certain weight due to the material it's made of. When you blow air into the balloon, the weight of the air inside balances out the weight of the balloon material, making the total weight of the balloon and air the same as the original balloon.