Lesson 9

Air Pressure

-force per unit area exerted on objects as a result of gas molecules colliding with those objects

Pressure - force applied over a specific area

- gas pressure caused by gas molecules striking objects or the walls of a container

Two Types

• Air pressure trapped inside a container
• Air pressure from the atmosphere outside

- atmosphere: mixture of gases surrounding you

- atmospheric pressure: air pressure that's always present on earth as a result of air molecules colliding with the surfaces of objects

Sea level has 14.7 lb/in squared of air pressure or 1 atm.

Practice Problems

3) the balloon would instantly expand until it popped because of the lack of outside air pressure

5) the cabin pressure and the pressure inside your head is a lot more than the air pressure outside the plane.

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