Standard Science Primary 4 Energy

Siti observed the liquid level in a laboratory thermometer rising when it was placed in a beaker of water. Which of the following explains her observation?

A The liquid in the thermometer gained heat and expanded.
B The liquid in the thermometer lost heat and contracted.
C The thermometer glass contracted.
D The water in the beaker gained heat and expanded.
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Worked Solution

Step 1: Heat flows from the warmer water to the cooler thermometer. Step [2-9]: The liquid inside gains heat, causing its molecules to move faster and take up more space. Step [2-9]: This expansion causes the level to rise up the tube.

Correct answer: The liquid in the thermometer gained heat and expanded.

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