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When the temperature of a liquid is increased its surface tension

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PHYSICS

When the temperature of a liquid is increased, its surface tension

  • A. Increases
  • B. Decreases
  • C. Remain constant
  • D. Increases then decreases

QUICK ANSWER…

B

DETAILS…

When the temperature of a liquid is increased, its surface tension decreases due to loosening cohesive forces on the surface.

To accurately answer this question, we need to understand exactly what surface tension is.

Surface tension is the ability of any liquid surface to form a thin coat of molecules attracted together by mutual cohesive forces. The molecules of the liquid on the surface gets attracted to each other and forms a coat of thin layer.

Now as the temperature of the liquid increases, these surface molecules begins to gain more kinetic energy, becoming more unstable and loosening the cohesive forces holding them together. Thus, an increase in temperature results in a decrease in surface tension. It’s that simple!

Now for the right answer to the above question:

  1. Option A is incorrect. does not increase.
  2. Option B is correct. yes, it decreases as the cohesive forces responsible for it is challenged by the increasing kinetic energy of the surface molecules.
  3. C is incorrect. does not remain constant.
  4. D is not the correct answer.

KEY-POINT…

You may please note these/this:

  • Introduction of more heat will challenge the strength of existing bonds responsible for the tension on the surface.

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/culled from 2019 JAMB-UTME physics question 15/

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