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Dalton's law is given as:
1. E= C[es + ea]
2. E= C[ea - es]
3. E= C[es - ea]
4. E= C[es + ew]

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Correct Answer - Option 3 : E= C[es - ea]

Explanation:

Evaporation:

  • The process of transformation of liquid water into a gaseous form is called evaporation.


Dalton's law:

  • It gives the relationship between the rate of evaporation and the difference between the saturation vapour pressure and existing vapour pressure, by the following expression


EL = C(es - ea)

Where, E= Rate of evaporation (mm/day), C = Constant, es = Saturation vapour pressure in mm of mercury, ea = Existing vapour pressure in mm of mercury

Dependency of the rate of evaporation on various factors:

  • Increases with an increase in vapour pressure at the water surface and air above it.
  • Increases with increases in Air and water temperature.
  • Increases when wind speed is above critical Wind speed.
  • Decrease with the increase in Atmospheric pressure.


Instrument name  Used for measuring
Psychrometer Relative humidity
Anemometer Wind velocity
Pluviometer Rainfall depth
Lysimeter Evapotranspiration
Atmometer Evaporation
Phytometer Transpiration
Hygrometer Relative humidity

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