A factor that doesn't vary in an experiment is called controlled variables or constants.
An experimental component that remains constant and unaltered during the course of an investigation is known as a control variable in science. One typical class of controlled variable is temperature. A temperature is controlled if it remains the same during an experiment. Other examples of controlled variables are the intensity of the light, the use of the same kind of glassware, a constant humidity level, and the length of the experiment.
A constant is an unchanging amount. A constant can be measured, but it cannot be changed during an experiment, or you decide not to modify it. Compare this to an experimental variable, which is a component of an experiment that the experiment itself affects.
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