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If one container is placed near a fan in a surface area experiment what will air speed become?

Answer and explanation

Correct answer: Additional influential variable

The direct answer is D: an additional influential variable. In a surface-area experiment, evaporation may be the measured result, while surface area is usually the factor being tested. Air movement from a fan can also change evaporation: faster moving air may remove water vapour more quickly. If only one container is near the fan, air speed is not part of the intended test and is not kept equal. Therefore it is an additional factor that influences the result, often called a confounding variable. A is not the air speed itself; the dependent variable is what is measured. B would be the deliberately changed factor. C is the recorded result, not a cause. Memory cue: an accidental influence is an extra variable.

Related tags

Air-SpeedExtra-VariableEvaporationControlVariables In An ExperimentExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary ScienceScience

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