allerySurface tension concerns only liquids because gases have no:
AFree surfaces
BFixed volumes
CHeavy molecules
DCurved menisci
Answer & Solution
Correct answer: A. Free surfaces
1. A gas spreads out to fill whatever container holds it.
2. It therefore never forms a free surface of its own.
3. So surface tension is a property of liquids alone.
_Source: syllabus Physics Part II, Chapter 10, Mechanical Properties of Fluids._
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