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A control variable is something in an experiment that is kept the same. Having control variables means that the experiment will be a fair test. The Control Variable is often used with the independent and dependant variables.
- "Doing a Fair Test: Variables for Beginners". sciencebuddies.org. http://www.sciencebuddies.org/science-fair-projects/project_experiment_fair_test.shtml. Retrieved 20 January 2011.