1 Explain the following observations, referring to the appropriate process of
heat transfer in each case.
a Two cups of tea are poured at the same time. They are left for ten minuten
One of the cups has a metal teaspoon left in it. The tea in this cup is cooler
than the tea in the other cup at the end of the ten-minute period.
b Two fresh cups of tea are poured. (The others had gone cold!) A thin
plastic lid is placed on top of one of the cups. The tea in this cup keeps
hot for longer.
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Answer:
a Some of the heat energy in the tea is transferred to the
spoon. Also, the metal spoon is a good conductor of
heat, so it increases the area from which the heat of
the tea can be lost.
b The plastic lid traps a layer of air above the tea. Air
is a poor conductor of heat. The trapped layer of air
also greatly reduces heat loss from the surface of the
hot tea by preventing convection currents in the air
above the cup. It also reduces the amount of heat lost
through evaporation.
Explanation:
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