Breathing+Invesacation

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

The balloon expands because more air is in the cup.

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

When you push up on the stretched balloon the tiny balloon shrinks inside because there is now less space in the cup and you are pushing air through the straw

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

Air. Because when you pull down the stretched balloon pulls air through the straw.

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 inhale, your lungs fill up with air when you exhale, your lungs push out all of the air built up in your lungs.

Excellent job on this investigation!