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​ OBSERVE: Pull down slowly on the stretched balloon. What happens to the balloon inside the cup? When you strertch the balloon down the smaller balloon fills with oxygen. That is because there is more space for the air to rush in to creating a vacum force.

Push up on the stretched balloon. What happens inside the cup? When you push up on the balloon the smaller balloon deflates and the oppsite side of the balloon clings to the other. This is because there is no longer more room for the oxygen infact there is less. When you push in I think that the oxygen is pushed out.

EVALUATE: Is there more or less space inside the cup when you pull down on the large balloon? I think that there is more. I think this because when you pull down on the balloon it expands letting more oxygen to flow in.

IDENTIFY: When you pull the large balloon down, what fills the extra space in the cup? When you pull the large balloon down oxygen fills the extra space. Just oxygen or ALL the gases in the outside air?

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. The experiment is just like breathing. When you pull down on the balloon it is like inhaleing and the little balloon is your lungs which fill with ari. when you push in it is lke your diaphram pushing up and pushing the air out. How is the air pressure the same in both the model and the real thing?

Faith, your answers are specific and thorough. Great job!