Advanced Science Primary 4 Matter

Ross poured 50 cm³ of sand into a 100 cm³ beaker already containing 50 cm³ of water. He noticed the total level was less than 100 cm³. Why?

A Sand dissolved in water.
B Water evaporated quickly.
C Air was trapped in the sand.
D Water occupied the spaces between sand grains.
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Worked Solution

Step 1: Sand is a granular solid with air spaces between the grains. Step [2-9]: Water flows into these spaces, replacing the air. Step [2-9]: Therefore, the combined volume is less than the sum of the individual volumes.

Correct answer: Water occupied the spaces between sand grains.

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