Discuss the various factors which affect the rate of evaporation. Latent heat of evaporation of two liquids A and B is 100 J/kg and 150 J/kg respectively. Which one can produce more cooling effect and why?
Answer:
Factors affecting the rate of evaporation:
- Surface area: The rate of evaporation increases with increase in surface area.
- Temperature: The rate of evaporation increases with increase in temperature.
- Humidity: The rate of evaporation decreases with increase in humidity.
- Wind speed: The rate of evaporation increases with increase in wind speed.
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Nature of the liquid: The volatile compounds evaporate faster than less volatile compounds (liquids).
B will produce more cooling effect because it will absorb more heat from the surroundings for evaporation.