Standard Science Primary 4 Matter

Sara inverted a glass with a dry tissue taped to the bottom and pushed it vertically into a basin of water. The tissue remained dry. Why?

A The tissue is waterproof.
B Air in the glass takes up space.
C Water cannot enter narrow spaces.
D Air in the glass has no mass.
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Worked Solution

Step 1: The glass is filled with air. Step 2: When pushed vertically, the air cannot escape. Step 3: Since air takes up space, it prevents the water from entering the glass and wetting the tissue.

Correct answer: Air in the glass takes up space.

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