Gas Pressure

When a balloon is inflated by blowing air into it, the air fills the balloon and pushes equally on all sides, causing the balloon to expand. This uniform pushing force occurs because gases exert pressure equally in all directions.

Now, if a small hole or pinhole is made in the balloon, air begins to escape from that point. As a result, the balloon cannot stay fully inflated because the air pressure inside decreases. This example helps us understand that, similar to liquids, gases also exert pressure on the walls of their container.

• The term used to describe both gases and liquids is "fluid." Fluids have the property of flowing and do not have a fixed shape, but they exert pressure on the walls and bottom of the container they are in.
• Importantly, the pressure exerted by a fluid in a closed container is equal in all directions at any given point. This means that if a fluid (like air in the balloon) is completely enclosed, it will push outwards evenly on every part of the container's walls.