Question

Describe the various factors which affect the rate of evaporation . Latent heat of vapoirisation of 2 liquids A and B is 100J/kg and 150 J/kg respectively .which one can produce more cooling effect and why?

Answer 1

there are four factors affecting it 
1)surface area - the more surface area then more evaporation will take place
as it is a surface phenomena
2)humidity-the more humidity then less evaporation will take place
as the water content in air will be higher and less space will be left 
3)wind speed- the more winds then more evaporation will take place
the winds carry away the water vapors with it leaving a lot of space for more evaporation 
4)temperature-the high temperature the more evaporation
a rise in temp. will make more water vapors
B will produce more cooling effect because it will absorb more heat than A