Question 17
Structure of Matter and Kinetic TheoryA piece of wire gauze can be made to lie on water because
- A.the wire gauze is less dense than water
- B.the water molecules repel the wire gauze upwards
- C.the water surface has the effect of an elastic thin skin
- D.of the cohesive forces between the water and the wire gauze molecules
Show the answer and explanation
Answer: C (the water surface has the effect of an elastic thin skin)
Explanation
Surface tension makes the water surface behave like a stretched elastic skin, which can support a light gauze even though the metal is denser than water.