1. Ms. Lempicki- 4 th Grade

2. Discuss: Why do balloons rise?

3. ( 1) be filled with a gas that is lighter than air, such as helium, or 2) be filled with air that is heated to make it "lighter" than the air outside of the balloon.

4. The air is less dense than the air around it, so it rises.

5. Helium is the second-lightest element, and the main sources for helium are natural gas fields (especially those in the states of Texas, Oklahoma, and Kansas). Heating air makes it less dense, making it essentially "lighter." Gas balloons and hot air balloons float because they are lighter than the air they displace.

7. Plastic garbage bags Paper clips String Balloons Hair dryer Decorations such as stickers

8. First, Decorate you plastic bag with scraps of paper and stickers.

9. Next, tie a string around the top of the plastic bag. Then, add paper clips around the bottom of the bag.