Control variable

A factor kept the same between experimental conditions so that a difference in results can be linked to the factor being tested.

A condition kept the same so that a comparison tests only the chosen independent variable.

A factor kept the same so that it does not affect the comparison.

A variable kept unchanged so that any difference in reaction rate can be attributed to the factor being investigated.

A quantity kept unchanged during an investigation so that the effect of the independent variable can be identified.

A factor that is kept the same so that different reactions or trials can be compared fairly.

An experimental variable kept the same so that a comparison is as fair as safety permits.

A factor kept constant because it could otherwise affect the dependent variable and make the comparison invalid.