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These changing quantities are called variables. A variable is any factor, trait, or condition that can exist in differing amounts or types. An experiment usually has three kinds of variables: independent, dependent, and controlled.The independent variable is the one that is changed by the scientist.To ensure a fair test, a good experiment has only one independent variable.n experiment usually has three kinds of variables: independent, dependent, and controlled. The independent variable is the one that is changed by the scientist. To ensure a fair test, a good experiment has only one independent variable.
Variables are factors or quantities that may be change or controlled in a scientific experiment. The three types of variables in a science project or experiment are independent, controlled and dependent variables. The independent variable is the condition or factor that is changed in the experiment and can affect the dependent variable. Continue Reading.