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Sodium bicarbonate rocket
A sodium bicarbonate rocket (sometimes called an Alka-Seltzer rocket) is a model rocket fashioned from a 35mm film canister and propelled by the generation of gas from an effervescent liquid. It is often used in science classes to demonstrate principles of chemistry and physics to students.
Additional recommended knowledge
In the experiment, a film canister is filled with water and an effervescent tablet (commonly Alka-Seltzer) and tightly sealed. After a short time, the evolved carbon dioxide reaches sufficient pressure to cause the body of the canister to be launched into the air with a popping sound. The canister may be elaborated with paper fins to resemble more closely a real rocket. 
Lessons based around the Alka-Seltzer rocket can focus on a number of principles. For example, the students are sometimes asked to experiment with the amounts of water and Alka-Seltzer to find the combination which propels the rocket the greatest distance. Alternatively they may derive equations to calculate the speed and velocity of the rocket from the distance it travels.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Sodium_bicarbonate_rocket". A list of authors is available in Wikipedia.|