The standard for comparison in a experiment is known as a control variable. This is useful to any experiment and serves as a reference point used to draw conclusions.
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The part of an experiment that's the standard for comparison is called the Control
The control serves as the standard in a science experiment.
Constants are factors in an experiment that stay the same. This should not be confused with controls -- which is a standard used for comparison
Control Test is the separate experiment that serves as a standard for comparison to identify experimental effects, changes of the dependent variable resulting from changes to the independent variable.
The control of an experiment is the part of an experiment that does not change, and is strictly used as a comparison to the variable that is being tested.