Question

Look at Fig. 1.3 and suggest in which of the vessels A,B, C or D the rate of evaporation will be the highest ?

• A. A
• B. B
• C. C
• D. D

Answer 1

The correct option is C C

The rate of evaporation increases with an increase of surface area.

So larger the surface area, higher will be rate of evaporation and vice versa.

Also, with the increase in airspeed will further increase the rate of evaporation.

In fig. D, the vessel is closed from the top, evaporation will be the least in that.
In fig. B, surface area of vessel is less, rate of evaporation will be low as compared to vessel A and C.
Now, vessel A and C have equal surface area, but, vessel C has a moving fan above it, which increases the rate of evaporation.

The order of rate of evaporation in these vessels will be:
C > A > B > D