Which property is unique to gases?
AThey have a fixed mass
BThey have a fixed volume
CThey have a fixed shape
DThey can be compressed easily
Answer & Solution
Correct answer: D. They can be compressed easily
1. Gases have large spaces between particles.
2. Applying pressure can push them closer together.
3. So gases can be compressed easily.
4. Solids and liquids resist compression strongly.
5. So compressibility is unique to gases.
_Source: Selina Concise Physics ICSE Class 8, Ch 1 'Matter'_
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