Standard Science Primary 5 Cycles

Sara wanted to test how the exposed surface area affects the rate of evaporation. She used two identical containers, P and Q, with different amounts of water. Why was her experiment NOT a fair test?

A The volume of water was different.
B The exposed surface area was the same.
C The containers were made of the same material.
D The temperature of the surroundings was the same.
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Worked Solution

Step 1: In a fair test, only the independent variable (surface area) should change. Step 2: All other variables, such as the initial volume of water, must be kept constant. Step 3: Using different volumes makes the test unfair.

Correct answer: The volume of water was different.

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