In this physical science exploration, small groups place a piece of antacid tablet into a film canister and step back to time how long it takes for the top to pop. They repeat the activity, altering either the amount or temperature of water. Unfortunately, the student lab sheet does not explain the variables or provide a data table, so you may want create your own. Also, the lesson plan instructs you to make toy cannons to place the canisters into, but this is time consuming and unnecessary.