WAEC SSCE - Physics - 1999 (Objective)

Question 1 Report

Which of the following statements about evaporation is not correct?

The rate of evaporation of a liquid varies with temperature

The molecules of an evaporating liquid have an average speed

Evaporation occurs when faster molecules escape from the surface of a liquid

Evaporation takes place inside a liquid.

Answer Details

The statement "Evaporation takes place inside a liquid" is not correct. Evaporation is a process in which a liquid changes into a gas or vapor state at its surface, without reaching its boiling point. It occurs when the faster molecules escape from the surface of a liquid, leaving behind the slower ones, which results in a decrease in temperature of the remaining liquid. The rate of evaporation depends on various factors, including temperature, humidity, surface area, and air flow. However, evaporation does not take place inside a liquid. The process occurs only at the surface of the liquid, where the faster molecules have enough energy to break the attractive forces of the liquid and escape into the surrounding space as vapor. The remaining liquid remains unaffected and does not evaporate from the inside. Therefore, the statement "Evaporation takes place inside a liquid" is not correct.






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