A party balloon stays inflated due to the forces of air pressure inside the balloon pushing against the elastic material of the balloon. This creates a balanced force that keeps the balloon from collapsing.
The forces that act on a constrained party balloon include the internal air pressure pushing against the elastic material of the balloon, the weight of the balloon itself, and any external forces such as the string or hand holding onto the balloon.
The size of a party balloon affects the amount of air pressure inside the balloon, which in turn affects the amount of force pushing against the elastic material. Therefore, a larger balloon will experience greater forces compared to a smaller balloon.
When a party balloon is released, the forces acting on it change. The air pressure inside the balloon is no longer constrained by the elastic material, causing it to rapidly escape and the balloon to deflate. The weight of the balloon and any external forces remain constant.
The shape of a party balloon can affect the distribution of forces acting on it. For example, a spherical balloon will have equal forces acting on all sides, while a long, cylindrical balloon will experience greater forces at the ends compared to the middle. This can also impact the stability and movement of the balloon in different environments.
