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What will you use for your experiment? What are the steps? Both are important questions to answer BEFORE you start your experiment. Be as detailed as you can when you are writing your materials list and your procedure!
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Use your senses to make observations about your experiment. What is happening? Science Fair experiments should be repeatable. This means that you can do it more than once. In fact, you will need results from more than one trial to make sure that the data is as accurate as possible. You should have results that you can measure with your tools. Include your measurements (numbers and units) in your observations.