* Gravity acts on mass: Gravity pulls on objects with mass. The air inside the balloon has mass, so gravity acts on it.
* Air pressure and buoyancy: The air inside the balloon is slightly more dense than the air outside. This creates a force pushing outwards (buoyancy) that counteracts the downward force of gravity on the air itself. However, the balloon itself is still pulled by gravity.
* The balloon's weight: The balloon's material also has mass, so it's pulled by gravity. This is why a balloon eventually falls to the ground.
In summary:
* Gravity affects everything with mass, including the air inside a balloon.
* The balloon itself is also pulled by gravity, and this is the primary reason it falls.
* The air pressure inside the balloon provides a small counteracting force (buoyancy), but it's not enough to overcome the force of gravity on the entire balloon.
