ScienceBreathing+Investigation12

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

Push up on the stretched balloon. What happens inside the cup? The balloon inside gets all of the air sucked out of it.

EVALUATE: Is there more or less space inside the cup when you pull down on the large balloon? There is more air in the cup.

IDENTIFY: When you pull the large balloon down, what fills the extra space in the cup? Air fills the extra 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 in, your lungs get smaller. When you breath out your lungs get bigger. Rethink that response; borrow a model and observe again. How is the pressure similar?