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OBSERVE: Pull down slowly on the stretched balloon. What happens to the balloon inside the cup? The ballon fills with air when you pull it down and when you push it up the ballon scrunches up.

Push up on the stretched balloon. What happens inside the cup? the smaller balloon scrunches up because it is taking air out of the cup.

EVALUATE: Is there more or less space inside the cup when you pull down on the large balloon? There is more because it lets all of the air fill up inside of it.

IDENTIFY: When you pull the large balloon down, what fills the extra space in the cup?

Air fills in the space.

COMPARE: How is the air pressure in the balloon similar to the air pressure in your lungs? Write down what you think happens when you breathe air into your lungs. When you breathe air into your lungs it expands and that is what happens when the pressure of the air goes into the balloon.

Rachel, you did a great job on this! You and your partner put some thought into all your responses. I like your word choice in your first two answers, too., Well done. You forgot to compare the air pressure in the balloon to that in your lungs. Tagging pages is now done in a new place. Once you have saved your changes, click on the "Page" tab and select "Details and Tags".Help · About · [|Blog] · Terms · Privacy · [|**Support**] · [|**Upgrade**]