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Which condition out of the following will increase the evaporation of water?1. Adding common salt to water2. Decrease in temperature of water 3. Decrease of surface are 4. Increase in temperature of water 5. None of the above/More than one of the above

Answer» Correct Answer - Option 4 : Increase in temperature of water 
  • Increase in temperature of water will increase the evaporation of water.
  • Evaporation is the process where a liquid is converted into its vapour and removed from the evaporating surface.
  • Energy is required to change the state of the molecules of water from liquid to vapour.
  • An increase in the temperature can provide this energy.
  • The driving force to remove water vapour from the evaporating surface is the difference between the water vapour pressure at the evaporating surface and that of the surrounding atmosphere.
  • As the surface area of the evaporating surface increases, the rate of evaporation increases.
  • Humidity also affects the rate of evaporation.
  • As evaporation proceeds, the surrounding air becomes gradually saturated and becomes more humid.
  • The process, hence, will slow down and might stop if the wet air is not transferred to the atmosphere (decrease in the humidity of the air).
  • The replacement of the saturated air with drier air depends greatly on wind speed.
  • Hence, surface area, temperature, humidity and wind speed are factors affecting the evaporation process.


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