LIVE Course for free

Rated by 1 million+ students
Get app now
0 votes
in General by (30.0k points)
closed by
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]

1 Answer

0 votes
by (54.3k points)
selected by
Best answer
Correct Answer - Option 3 : E= C[es - ea]



  • 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

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.