![]() > 2 (or more) cans of spray paint - Pick your own favorite colors! > Clear Shipping Tape - It's thicker than regular scotch tape and about 2" wide. > 2 (or more) Markers - I used Sharpies, one black and one Silver This can usually be found at any hardware store - kids, ask your parents for help with this glue. read all safety warnings before using.) Feel free to experiment with other glues. Do NOT get it on your skin or eyes, or hair, etc. > 5 Min Epoxy (This stuff is nasty! Do not inhale, and use in a well ventilated area. ![]() To learn more about foam core try wikipedia: Foam Core can be found at almost any arts and crafts supply store. > 1 Large sheet of Foam Core (I prefer Black, but any color will do). > 1 sharp knife (kids get your parents help here!) I prefer X-acto brand for cutting foam core. This Instructable is set up for 2 liter sized bottles - feel free to adjust for any size though. Add a cone and fins to your rocket (such as out of construction paper) and launch it again using the best conditions you found.- Note: There are slight differences in the openings of the bottle depending on the soda brand.(Adjust and use just enough water for the baking soda to stick to the depression in the lid.) How does changing the amount of baking soda in the lid affect the canister's launch? For example, you could try comparing 1 tsp., ¾ tsp., ½ tsp., and ¼ tsp. You could try changing the amount of baking soda (but keeping the amount of vinegar the same) and see how this affects the canister's launch.(You could also repeat the same conditions you tested to see how consistent your results are.) How does changing the amount of vinegar in the canister change how it launches? You can try varying the amount of vinegar even more and see how this affects the rocket's launch, such as using 1 tsp., 2 tsp., 3 tsp., etc., of vinegar.The result is a longer wait time for a much higher rocket launch. This means that it also takes longer (the reaction that makes the carbon dioxide can only happen so fast) for the pressure to build up. When the rocket is built with a lot of empty space inside of it (in other words, when it has very little vinegar), there is more room for the carbon dioxide to fill, so it becomes more fully filled with the gas. The canister is pressed upwards and thus flies into the air. The lid is pressed downwards by the pressure, but it is lying on the ground so it goes nowhere. The carbon dioxide compresses in the empty part of the container until the pressure is so great it causes the cap and canister to pop apart. The longer they react, the more gas is made. The vinegar and baking soda react making carbon dioxide. This is pretty close to what happens in this rocket experiment. Eventually if you added too much stuffing the pressure would be so great that the teddy bear's seams would split. As you add more stuffing, the bear gets firmer. The cotton stuffing has lots of empty air space too, which means you can keep squeezing (compressing) the stuffing and adding more. You can think of it like a stuffed teddy bear. This is because a gas has lots of space between its molecules. Unlike a liquid (like water) or a solid (like rock), a gas can be squeezed (technically we say it is compressed) so that more of it fits in the same space. In our trials, the rocket nearly full of vinegar launched roughly 6 feet up into the air, but the rocket filled with the least amount of vinegar flew more than twice as high - nearly 15 feet! It takes longer for enough carbon dioxide gas to be made to fill this larger space so that there is enough pressure in the canister to pop the lid open like it did before. Because there is less vinegar in the canister, there is more space for carbon dioxide gas to fill. You may have noticed that when the least amount of vinegar was used, it took a little longer to launch than when more vinegar was used but the launch height was higher. This is how the chemical reaction provides the thrust the canister needs to launch. The rapid escape of the gas forces the rest of the canister to be tossed in the air - just like the release of air from the open end of a balloon can cause a balloon to fly through the air. The pressurized carbon dioxide then quickly escapes the canister through the open bottom. In the capped film canister, the carbon dioxide gas builds up until the pressure of all of the contained gas causes the canister to pop open. Do not worry - the small amount of carbon dioxide is not harmful to you! It is one of the gases you breath out when you exhale, and a gas that plants want to take in when they do their version of "breathing". When baking soda and vinegar are mixed together, the reaction produces water and carbon dioxide gas. If you launched your rocket on a concrete surface, spray the surface down with some water to clean it when you are all done doing your launches.
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