Standard Science Primary 5 Cycles

Jun Jie wanted to find out if the exposed surface area of water affects the rate of evaporation. He used two identical containers and placed them in the same room. What else must he keep the same to ensure a fair test?

A The size of the container opening
B The exposed surface area of the water
C The amount of water at the start
D The color of the water
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Worked Solution

Step 1: In a fair test, only one variable is changed. The changed variable is the exposed surface area. Step 2: Therefore, the containers must have different opening sizes, so option 3 is incorrect. Step 3: All other variables, including the volume (amount) of water at the start, location, and temperature, must be kept constant.

Correct answer: The amount of water at the start

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