Standard Science Primary 4 Energy

A flask filled with colored water has a thin glass tube inserted through the stopper. When the flask is placed in a basin of ice water, the water level in the tube __________.

A rises immediately
B drops because water contracts when it loses heat
C remains the same
D rises because the glass flask expands
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Worked Solution

Step 1: Ice water is colder than the flask. Step 2: The water in the flask loses heat to the ice water. Step 3: When liquids lose heat, they contract and occupy less space, causing the level to drop.

Correct answer: drops because water contracts when it loses heat

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