Air has matter, that has weight and occupies space.If we take a balloon with no air in it and throw it up it comes down very fast but if we fill the balloon with air and throw it up it comes down after some time with normal air, not helium.Why does this happen?  

1. When a filled balloon and an unfilled balloon fall on the Earth, both are subjected to gravity and buoyancy force.

2. The buoyance force is dependent of the surface area as it is created by the amount of air displaced by the object.

3. Since the buoyancy force for unfilled balloon is small, it is not much resisted and falls freely while filled balloon has similar mass but has large surface area so buoyancy is of applicable amount and it is lifted up before falling slowly on floor.

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because the air escapes it will fall down
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 because of the gravity
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