For this activity students will observe how temperature affects different types of gases. First students will blow up a round balloon. They will need to measure the circumference in centimeters of the fattest part of the balloon. Then they will put the balloon in the freezer for approximately 30-60 minutes. (A chest freezer tends to work best) They will remove the balloon from the freezer and quickly measure the circumference of the balloon again in centimeters, recording beginning and end results in a journal.