Buoyancy in gases

To find out if the balloon will rise upwardly or sink down, we compare its weight force to its buoyancy.

Buoyancy FA counteracts the weight force (FG ) of the body (picture below).
If the buoyancy is greater than the weight force of a body, it will rise upwardly.
If the buoyancy equals the weight force, the body will float.
If the weight force is greater than the buoyancy, the body will sink down.

fa_groesser Gleichgewicht Fg_groesser
If FA > FG, the balloon will rise. IfFA = FG, the balloon will float
in the air. 		If FA < FG, the balloon will sink.

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