Introduction:
When we stick a pin in a balloon, it creates a loud bursting sound. This sound is produced due to the sudden release of air from the balloon. Let's delve into the details of why it sounds like a burst.

Explanation:
Elasticity of the balloon:
- Balloons are made of elastic materials such as latex or rubber. These materials can stretch and expand when inflated.
- When we blow air into a balloon, the elastic walls of the balloon stretch to accommodate the increased volume of air.

Pressure buildup:
- As we continue to blow air into the balloon, the pressure inside the balloon increases.
- The air molecules inside the balloon collide with the inner surface of the balloon, exerting a force on it.
- This force creates an outward pressure on the balloon walls.

Pin insertion:
- When we insert a pin into the balloon, we create a small hole in the elastic material.
- The hole acts as an escape route for the highly pressurized air inside the balloon.

Rapid air release:
- As soon as the pin punctures the balloon, the highly pressurized air inside rushes out through the hole.
- The air molecules move rapidly and collide with each other and the surrounding air molecules.

Sound production:
- The rapid movement and collision of air molecules create vibrations in the surrounding air.
- These vibrations travel as sound waves through the air.
- When these sound waves reach our ears, they are detected by the auditory system, and we perceive the sound as a burst.

Conclusion:
When we stick a pin in a balloon, the loud bursting sound is produced due to the rapid release of highly pressurized air. The vibrations created by the movement and collision of air molecules travel as sound waves, which we perceive as a burst.

Because the air comes out with a huge pressure and makes a sound like (brust)