Advanced Science Primary 4 Energy

Sara wants to find out if the thickness of a material affects how fast heat passes through it. Which variables must she keep the same?

A The time taken and the thickness.
B The thickness of the material and the starting temperature.
C The thickness of the material and the type of material.
D The type of material and the starting temperature.
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Worked Solution

Step 1: Identify the independent variable (Thickness). This must change. Step 2: All other variables must be constant (Type of material, starting temp, volume of water). Step 3: This ensures a fair test.

Correct answer: The type of material and the starting temperature.

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