Question

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

Moving Fan A B C

• A. A
• B. B
• C. C
• D. D

Answer 1

The correct option is C

C

The explanation for the correct answer

Option (c)

• The surface area of the vessel and the wind speed affects the rate of evaporation.
• The rate of evaporation increases with the increase in surface area and wind speed.
• The surface areas of vessels C, A, and D are similar.
• But the wind speed is greater above the vessel C, because of the fan,
• Hence the rate of evaporation will be highest in the vessel C

The explanation for incorrect answer

Option (a)

• Though the surface area of vessel A is same as surface area of vessel C.
• But Vessel A is far apart from the fan, which decreases the rate of evaporation in vessel A.

Option (b)

• The surface area of vessel B is much smaller as compared to other vessels.
• Hence the rate of evaporation will be less in vessel B.

Option (d)

• The surface area of vessel D is equal to the surface area of vessel C.
• Also, vessel D is in close proximity to the fan.
• But vessel D is covered with a lid.
• Hence the rate of evaporation decreases in vessel D.

Hence, In vessel C, the rate of evaporation will be the largest option (c).