SCIENCE+I+INCESTAGATION+18

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

Push up on the stretched balloon. What happens inside the cup? When you stretch the balloon it delfates with air going out of it.

EVALUATE: Is there more or less space inside the cup when you pull down on the large balloon? There is less space when you pull on the large balloon, beacause it is inflating with air. Rachel, think about this. If there is less room in the space, how can it fill up with air?

IDENTIFY: When you pull the large balloon down, what fills the extra space in the cup? The extra space in the cup is filled with 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. I think when you breath in your lung's it is similar beacause it inflats, and deflats.

Rachael, you have made good observations and conclusions. You might want to expand your response in the COMPARE section of this investigation; think more deeply.