Standard Science Primary 4 Cycles

When air is pumped into a football, the football becomes harder but its size does not change much. This is because air __________.

A has a definite shape
B has no mass
C can be compressed
D has no definite volume
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Worked Solution

Step 1: Air is a gas. Step 2: Gases have no definite volume and can be compressed into a smaller space. Step 3: Pumping more air into the fixed size of a football increases the pressure/hardness because air is compressed.

Correct answer: can be compressed

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