Advanced Science Primary 5 Cycles

Sara conducted an experiment to see how the surface area of water affects the rate of evaporation. She used two containers, X and Y, with different openings. Which of the following must she keep the same for a fair test?

A The surface area of the water exposed to air
B The volume of water at the start
C The shape of the containers
D The amount of water left after an hour
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Worked Solution

Step 1: Identify the aim (test surface area). Step 2: The independent variable is surface area. Step 3: All other variables, such as starting volume and temperature, must be kept constant.

Correct answer: The volume of water at the start

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