Control variable - A factor that must be kept constant throughout the experiment, Preliminary investigation - An initial experiment to decide the range, intervals or set values to be used, Fair test - An experiment in which only the independent variable is changed, Risk assessment - Identify the hazards and plan how to make them safer, Independent variable - The factor you are trying to find the effect of in the investigation, Reproducibility - When the same results are achieved even if a different person does the experiment or different equipment is used,

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