Materials:

Alka Seltzer Tablets (generic work fine and are cheaper), Empty Film Canisters (clear ones work best), Hot Water

Instructions:

Draw a line around bottom of film canister about 1 cm from bottom (a little less than 1/2" for the metrically impaired). Fill up to that line with warm water. I use tap water that is hot enough to be steaming and fill a coffee mug with cover on it so the kids can pour the water themselves. Place 1/4 of an Alka seltzer tablet in the canister and immediately secure cover, turn upside down and place on sidewalk/driveway or similar surface in open area (BTW, this is an outdoor activity!) Stand back and wait for "explosion" as the gases build up and the film canister bottom goes FLYING in the air about 20 feet. Be sure to buy lots of Alka Seltzer because the kids want to do this one again and again!!!!

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