Question

One litre of water is kept in 5 different bowls with different surface areas at the top surface. Choose the bowl in which the water will evaporate fastest.

• A. Bowl with top surface area = $200$ m${}^2$
• B. Bowl with top surface area = $350$ m${}^2$
• C. Bowl with top surface area = $100$ m${}^2$
• D. Bowl with top surface area = $50$ m${}^2$

Answer 1

The correct option is B Bowl with top surface area = $350$ m${}^2$

Rate of evaporation is directly proportional to change in surface area. If the surface area is increased, then the amount of liquid exposed to atmosphere also increases. Hence, the evaporation will be the fastest in the bowl with top surface area of $350$ m${}^2$.