WAEC Physics 2012 Theory — Question 6
Question 6 of 15 from the West African Examinations Council (WAEC) Physics 2012 Theory paper, with the correct answer and a full explanation.
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6. (a) Define surface tension. (b) State two methods by which the surface tension of a liquid can be reduced.
Model answer
(a) Surface tension is the property of a liquid surface which enables it to behave like a stretched elastic skin, due to the cohesive forces between the liquid molecules at the surface. (b) Methods of reducing surface tension: (i) Increasing the temperature of the liquid. (ii) Adding a detergent/surfactant to the liquid.
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