Standard Science Primary 4 Matter

Siti inverted a plastic cup with a small hole at the bottom into a basin of water. She observed that some water entered the cup. Why did this happen?

A Air escaped through the hole, allowing water to enter.
B The cup was heavier than the water.
C Air in the cup was compressed.
D Water has no definite shape.
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Worked Solution

Step 1: Air occupies space. Step [2-9]: Water can only enter the cup if the space occupied by air is vacated. Step [2-9]: The hole allows air to escape, so water moves in to take its place.

Correct answer: Air escaped through the hole, allowing water to enter.

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