Why Does An Air Balloon Drop To The Ground?

Answer 1

Depends.

IF you mean BALLOON then the following is the answer

If it is a small cold air balloon gravity simply pulls it down as it is denser than the surrounding air (ie. it weighs more for the space it take up then the surrounding air it displaces).

If it is a hot air balloon then the hot air has expanded so as to displace the heavier cold air inside and around the balloon and now being less dense than the surrounding air it simply floats upwards defeating gravity (the reality is that the balloon only appears to rise - what actually happens is that the colder air falls around the hot air). Once the hot air cools the balloon shrinks in size displacing less cold air around it and it is now denser than the surrounding air and gravity takes over and the balloon is pulled toward the earth (commonly called "down")

IF you really meant a guy named Ballon he was a German Ballet dancer and probably tripped

IF you mean a Balloon flask as used in Chemical procedures to catch the drippings of distillation then some one only has to knock it off the bench.

IF you mean the village of Ballon it is already ground. Although the air in the balloon is the same density as the air outside, the rubber weighs it down pulling it to the ground.

This doesn't happen with helium balloons because they are so much less dense than air that they can carry the plastic.