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Which variable must be kept the same while testing the effect of stirring speed?

Answer and explanation

Correct answer: Water temperature

Stirring speed is the independent variable because it is deliberately changed. The time taken to dissolve is the dependent variable because it is measured. Water temperature also affects the rate of dissolving, so it must be kept constant in every trial for a fair test. Exam tip: Change only the factor being investigated and control other factors that can affect the result.

Related tags

Variables In ExperimentControlled VariableStirring SpeedDissolving RateFair TestVariables In An ExperimentExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary Science

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