It depends on what the experiment is designed to do!
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The constants in an experiment is any factor that remains the same and does not change. These things are kept the same throughout each trial of the experiment.
the controlled variables are the factors that are kept constant during an experiment. if they are not kept constant then they may affect the outcome of the experiment. the manipulated variable is the factor that is different between the experiment and the control. the responding variable is the variable that is being measured in the experiment.
A controlled variable is the thing that is kept consistent in between trials of doing an experiment. e.g: time is kept the same or kept consistent...
It is called the control variable. It is used to compare to your experimental results.
tom ford