Understanding Gases §fill balloons §propel bullets §form the Earth’s atmosphere §are invisible...

UnderstandingGases

Gases fill balloons propel bullets form the Earth’s

atmosphere are invisible have the ability to expand

and contract are made of atoms or

molecules

What Do Gases Look Like?

If we could magnify gas atoms and molecules a hundred million times they would look something like the wildly flying Ping- Pong balls of state lottery games.

What happens when you heat gas molecules?

Let’s try this experiment and find out.

What is inside of this bottle?

PREDICT: What will happen to the balloon if the bottle is placed in hot water?

What do you see happening to the balloon?

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What is making the balloon expand?What is happening to the molecules inside the

bottle?

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What would happen if the air inside the bottle was cooled?

Let’s replace the hot water with ice and find out!

What is happening to the balloon now?

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And now?

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And now?

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What is causing the balloon to collapse?What is happening to the molecules inside the

bottle?

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The Science Behind it All

Heating gas causes molecules to

Speed up

They actually move so fast that they collide with eachother with great force. This increases the pressure inside

the bottle causing the balloon to expand in response to the increased pressure inside the bottle.

Cooling the gas inside the bottle causes the molecules to

Slow down

They move very slowly and contact each other with much less force.

The molecule pack in closer together.