Use this chart to help answer the following: a) Which methods of heat transfer a

Question

Use this chart to help answer the following:

a) Which methods of heat transfer are responsible for the temperature changes in the liquid? In general, how does the rate of heat transfer (from cube to liquid) compare to the previous case (from hot plate to cube)? Can you think of a general explanation for a rate difference?

b)

Eventually, in all of the trials above, the temperature stops changing. Briefly discuss why this happens. Include in your discussion the role of heat flow, temperature differences, and equilibrium.

Cube Initial Cube FinalLiquid Initial Liquid Final Equilibrium Cube Temp (°C)Temp (°C)Temp (°C) Temp (°C) Time (s) 60.00 °O 26.26°C 20.00°C 26.25°C 42.50 s Quartz 2 80.00 °C 29.37"? 20.00"? 29.37"? 46.30 s 60.00"? 28.04"? 20.00"C 28.04"? 28.50 s Ruby 2 80.00 °C 32.05"? 20.00"C 32.05 °C 33.40 s 60.00 C 26.74 °C 20.00 C 26.74 °C 25.00 s Aluminum 2 80.00 °C 30.11 °C 20.00 C 30.11 °C 26.90 s 60.00 C 26.74 °C 20.00 C 26.74 °C 24.50 s Gold 2 80.00 °C 30.12°C 20.00 °C 30.12°C 23.20 s

Explanation / Answer

(a) in the shown cases of heat transfer, the convection mode of heat transfer is responsible for the change in the temperature of the cube and liquid. Inside cube, however, the heat transfer is due to conduction, while on the interface of liquid and solid, it is convection. That is the reason for different resuls in case of hot plate, where there is no or negligible volume inside of material and no comduction of heat occurs and only mode of heat transfer is convection.

(b) In all modes of heat transfer, namely conduction, convection and radiation, the rate of heat transfer depends up on the temperature difference. In some time, when liquid and solid attain nearly same temperature due to heat exchange, the heat flow between these bodies stops and the system is said to be in thermal equilibrium.

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