1. Atmospheric Pressure:
* The air surrounding the can exerts a force on it called atmospheric pressure. This pressure is significant, about 14.7 pounds per square inch at sea level.
2. Pressure Inside the Can:
* When the can is sealed, the air inside is at the same pressure as the air outside (atmospheric pressure). This creates a balance of forces.
3. Removing Air:
* When you pump out the air inside the can, you remove a significant portion of the air molecules. This reduces the pressure inside the can considerably.
4. Pressure Difference:
* Now there's a large difference in pressure between the inside and outside of the can. The high atmospheric pressure outside pushes inward on the can, while the lower pressure inside offers little resistance.
5. Collapsing:
* The imbalance of forces causes the tin can to deform and collapse inward. The can's walls are not strong enough to withstand the significant pressure difference.
In simpler terms:
Think of the can as a balloon. When you blow air into a balloon, it expands because the pressure inside is greater than the air pressure outside. When you pump air out of the can, you're essentially "sucking" the can inwards because the pressure outside is now much stronger than the pressure inside.
