What Is the Meaning of Controlled Variable?

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A controlled variable is a variable in an experiment that never changes. It allows the experimenter to have a set point to compare their results to, and to determine if their experiment was a success.
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controlled variable | Define controlled variable at Dictionary.com
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The term controlled variable refers to something that normally remains constant and unchanged in an experiment. This term can also be used to refer to variables that cab be input or keyed in to the control system.
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