What happens as you push up the balloons in the science activity called Bottled Balloons?

In the Bottled Balloons activity, as you push up the balloons into the bottle, you compress the air inside. This increase in pressure causes the air to push back against the balloon, making it expand and fill with air. When you release the balloon, the pressure is released, allowing the air to escape and causing the balloon to deflate. This demonstrates principles of air pressure and volume in a fun and interactive way.