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    solid, liquid and a gas
    By 1956BD

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    This is a fun thing to do with a solid, liquid and a gas. Collect several of those little plastic film canisters with the lid. Fill each about two thirds with water (liquid). Then add about one fourth of an Alka Seltzer tablet (solid). Then put the lid on and wait. The canister will make a pop. What is making that pop? It is the gas! The kids will love it.

    Try it yourself first to make sure the strength of your tablets gives the right level of pop. You do not want the gas to blow the lid off and scare your students. I have never had that happen, but just be sure with your brand of tablets. I always buy the cheapest generic brand.

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