It is the variables you will not change to keep the experiment a fair test, they should be kept constant to show how your independent variable affects your dependant variable.
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The controlled variable is the variable that is kept constant , meaning not changed, throughout the entire experiment.
The three variables of a science project are: 1. Controlled variable: A controlled variable means the part of the experiment that stays the same. This is also called the dependent variable. 2. Manipulated variable: A manipulated variable is something that can be changed by the experimenter. Also known as the independent variable. 3. Responding variable: A responding variable is the variable which you have to measure to get your results. So, you do not know the values of this variable until you measure it.
A well designed science fair project should have one independent variable, one dependent variable, and lots of factors that are held constant as you repeat the experiment several times to verify your results.
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it is a variable that you allow to stay the same throughout the experiment.