On a day when I am in hurry to go to office, I have a fixed quantity of rice which was just cooked and kept in a bowl. In order to cool it quickly, which one of the following is the <strong>BEST</strong> option?
- A. Let it be kept on the table in a room where there is no fan, no air conditioner
- B. Let it be kept in a room with AC set at a temperature around 23^\circ C and a ceiling fan (or table fan) operating at slow speed
- C. Let it be kept in a bowl of water (at room temperature) and operating a ceiling fan (or table fan) at full speed ✓
- D. Let it be kept in a bowl of water at room temperature only
Correct Answer: C. Let it be kept in a bowl of water (at room temperature) and operating a ceiling fan (or table fan) at full speed
Explanation
Water has a much higher specific heat capacity and thermal conductivity than air, drawing heat out via conduction. Simultaneously operating a fan at full speed maximizes forced convection and evaporative cooling.
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