Yes.
Gravity is what gives us our weight. It is how much gravity is pulling on us.
To calculate weight using specific gravity, you multiply the specific gravity of the substance by the weight of the substance in air. This gives you the weight of the substance in a vacuum.
An object's weight in air is the same as its weight in a vacuum. This is because weight measures the force of gravity acting on an object, and gravity affects objects in air and in vacuum in the same way.
No, it gives you weight. Mass does not change in the presence of gravity.
No, weight is a measure of the force due to gravity acting on an object. Even if air disappears, the force of gravity will still act on the object, so its weight will not disappear.
Air has mass because it is made up of molecules, primarily nitrogen and oxygen. Weight, on the other hand, is the force of gravity acting on an object's mass. So, air does not have weight itself, but the air in an object (such as a balloon) would be influenced by gravity and have weight.
air has weight
Yes. Earth's*
No
Gravity causes air pressure by pulling air molecules towards the Earth's surface. The weight of the air above creates pressure on the air below it. The higher you go, the lesser the air pressure due to less weight above pushing down.
gravity
you will float up in the air