Advanced Science Primary 4 Energy

In an experiment to find out if the material of a container affects how fast water cools down, which variables must be kept the same?

A Type of material and volume of water
B Size of container and type of material
C Starting temperature and type of material
D Volume of water and starting temperature
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Worked Solution

Step 1: The aim is to test the material (Independent Variable). Step 2: All other factors (Volume, Starting Temp, Environment) must be constant (Controlled Variables) for a fair test.

Correct answer: Volume of water and starting temperature

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