scince

OBSERVE: Pull down slowly on the stretched balloon. What happens to the balloon inside the cup?

the balloon expanded.

Push up on the stretched balloon. What happens inside the cup? the air in the balloon wants to get out so it exits through the straw because it is the only exit

EVALUATE: Is there more or less space inside the cup when you pull down on the large balloon?

Less because the air expands. Rethink this answer.

IDENTIFY: When you pull the large balloon down, what fills the extra space in the cup? The balloon expanding Yes, but why? What is filling up that 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 breath out you let the air out of you and when you breath in you fill up your lungs with oxygen How is the air pressure similar in the model and your actual lungs?