What Do These Things Have In Common?

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What Do These Things Have In Common? - PowerPoint PPT Presentation

What Do These Things Have In Common?. These objects need air pressure to work!. What is Air Pressure?. What is your guess?. Air Pressure…. pushes on everything it touches! is all around you! BUT…… I don’t see it! I don’t feel it!. Air Pressure Pushes Down on Pig Pen!.

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Presentation Transcript
What Do These Things Have In Common?

These objects need air pressure to work!

What is Air Pressure?

Air Pressure…
• pushes on everything it touches!
• is all around you!

BUT……

• I don’t see it!
• I don’t feel it!
What Just Happened?
• What pushed the egg into the jar?
• How strong is air pressure?
• Why don’t we get squashed

by air pressure?

Here is what happened…

1. The matches warm the air in

the bottle. When air is heated,

it takes up more space, and it pushes

against the sides of the bottle.

2. Some of the warm air tries to escape

out of the bottle.

3. And when the matches go out, the air in the

bottle becomes cooler.

4. The cooler air takes up less space.

5. Now, the air outside the bottle pushes with

greater power than the air inside the bottle.

6. The greater pressure outside

pushes the egg into the bottle!

Air Pressure Doesn’t Squash You Because…

You have air inside of you. It pushes out with the same amount of pressure that the outside air pushes in on you.

Air pushes in all directions!!

Let’s try an experiment!

Sometimes You Can Feel Air Pressure Change!

Have your ears ever popped when you’ve gone up a mountain or up in an airplane?

Do you know why?

Air Pressure Changes

Up here I have little weight on me. I feel little pressure.

The higher you go, the less air pressure

pushes.

because they

are trying to

make the inside

and outside

pressure equal.

Down here I have lots of weight on me. I feel high pressure.

Calvin & Hobbes are climbing to the top of a mountain. Will the air push against them more or less when they reach the top? Explain your answer.

This is what you do…