Hot airballoon
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The document provides instructions for making a hot air balloon demonstration for a classroom using inexpensive materials. It describes melting the edges of a sheet of plastic together with a heat gun, leaving an opening at the bottom for inflation. A blow dryer is used to inflate the balloon with hot air, causing it to rise, demonstrating convection. Safety tips are included, such as tying a string to retrieve the balloon after launching outside.
Hot airballoon
- 1. Making a Hot Air Balloon 9th Annual Day of the Teacher Conference March 26, 2011 CSUEB Concord Campus Charles Reynes Elementary Science Specialist Castro Valley, USD
- 2. Making a Hot Air Balloon Here is a simple way to make an extraordinary classroom demonstration that can be used whenever the concept of convection comes up in your curriculum.
- 3. Making a Hot Air Balloon Heres what you need. 0.35ml plastic sheeting Heat or embossing gun Extension cord 5-6 foot stick 1x 3/4 A wooden yard stick works well. Garage floor (heat resistant)
- 4. Making a Hot Air Balloon Pick up some 0.35 ml plastic painters tarp. I bought a big roll at The Home Depot, but I am sure smaller quantities are available.
- 5. Making a Hot Air Balloon Roll out about 9-12 feet of the plastic sheeting.
- 6. Making a Hot Air Balloon Spread out the sheet of plastic. Fold it in half. Use a heat gun to melt the edges together on three sides. Leave a hole at the bottom for inflation. Seams Fold Hole for inflating
- 7. Making a Hot Air Balloon Place the stick along the edges to be melted together. Leave a 1-2 inch space between the stick and the edge of the plastic.
- 8. Making a Hot Air Balloon Run the heat gun along the seam. The plastic will shrink and weld together. This may take some practice. Do this on a heat resistant (cement) floor.
- 9. Making a Hot Air Balloon Move the stick as you go along. Here I am rounding the corner.
- 10. Making a Hot Air Balloon Skip about ten inches in the middle of the bottom seam. This is where you fill the balloon with hot air from a blow drier.
- 11. Making a Hot Air Balloon Use a blow drier to inflate the balloon. When I launch the balloon in class, I often fill it with cold air first. Then I fill it with hot air and let it rise to the ceiling.
- 12. Making a Hot Air Balloon When I launch the balloon outside, I tie kite string to one corner so that I can reel it back in and use it again. Never let the balloon get away. What if it landed on a freeway? Enjoy!