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Make your own indoor hot air balloon Here are step-by-step instruction on how you can build your own indoor hot air balloon made out of a plastic film dry cleaner bag, courtesy of NASA — the National Aeronautics and Space Administration. MATERIALS: Dry cleaner plastic film bags — select a bag with the thinnest possible plastic and have several on hand. You may have to experiment with bags of different thicknesses. Several small paper clips Cellophane tape Heat source — blow dryer PROCEDURE: 1. Seal any openings and tears in the upper end of the bag with a minimum of cellophane tape. 2. Attach several paper clips to the plastic around the lower opening. The number of paper clips to attach is deter- mined by experimentation. 3. Turn on the blow dryer. Spread the bag opening wide to capture the rising hot air while supporting the upper end with your hand. It is best to have assis- tance in keeping the bag open so that it does not melt. 4. When the bag is inflated with hot air, test its buoyancy by letting it go for a moment. If it rises quickly, stand back and let it fly otherwise continue heating it for a little while longer. 5. If the bag tips over and spills its hot air before it reaches the ceiling, add a few more paper clips to weigh down the bottom slightly. If the bag will not rise at all, remove a few clips. CAUTION: If the bag starts to crumple and melt from the heat, set the blow dryer on a lower setting or hold the bag farther from the heat source. DISCUSSION: Hot air is less dense than cold air. Heat accel- erates the motion of the air molecules causing fewer molecules to occupy the same space as a much greater number of molecules do at a lower temperature. With fewer mole- cules, the hot air has less mass, and therefore is more buoyant than an equal volume of colder air. Placing the dry cleaner bag over the heat source captures the hot air and forces out the cooler air in the bag. The bag becomes a mass of low-density air which floats upward in the higher, denser air surrounding it. The paper clips are placed at the bot- tom of the bag to keep the open end downward in flight to prevent it from prematurely spilling the hot air and ter- minating the flight. Rub A Dub Dog Grooming Full Service Dog & Cat Grooming All Breeds and Sizes Veterinarian Recommended • No Tranquilizers Used FURminator Shed-Less Service Reduces Shedding 60-80% When Performed Every 4-6 Weeks Use What The Pros Use-Now Offering Grooming Supplies LIMIT 1 PER HOUSEHOLD. MAY NOT BE COMBINED WITH ANY OTHER OFFER. 813 Lincoln St. Red Bluff Page 6 Friday, October 22, 2010 $5 OFF GROOMING (530) 528-2364 www.rubadubdoggromming.com Red Bluff Daily News COUPON COUPON