Factors Affecting Evaporation Rate

Evaporation is the process where a liquid turns into a gas or vapor. Several factors influence how quickly this happens. The question asks to identify the condition listed that does NOT increase the rate of evaporation.

Analysis of Factors

• Increase in wind speed: Wind removes vapor molecules from above the liquid surface, decreasing the concentration of vapor in the air and allowing more liquid to evaporate. Thus, increased wind speed increases the evaporation rate.
• Increase in temperature: Higher temperatures give liquid molecules more kinetic energy, making it easier for them to escape the liquid surface and become vapor. Thus, increased temperature increases the evaporation rate.
• Increase in humidity: Humidity refers to the amount of water vapor already present in the air. High humidity means the air is nearly saturated with vapor, which hinders the escape of more molecules from the liquid surface. Thus, increased humidity decreases the evaporation rate.
• Increase in surface area: A larger surface area exposes more liquid molecules to the air, providing more opportunities for evaporation. Thus, increased surface area increases the evaporation rate.

Conclusion

Based on the analysis, an increase in humidity reduces the rate of evaporation, contrary to the other factors listed which increase it. Therefore, the statement that the rate of evaporation increases with an increase in humidity is incorrect.