A laboratory thermometer A is kept 7 cm away on the side of the flame while a similar thermometer B is kept 7 cm above the flame of a candle as shown in Figure Which of the thermometers, A or B, will show a greater rise in temperature? Give a reason for your answer.

Answer: (B)

Because the air near the candle heats up and rises due to convection, thermometer B will receive more heat than thermometer A.

Convection

Convection is the process of heat transfer by the bulk movement of molecules within fluids such as gases and liquids. The initial heat transfer between the object and the fluid takes place through conduction, but the bulk heat transfer happens due to the motion of the fluid.

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