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State the mode/ different modes, of heat transfer, in the following situations:
a. A paper cup, full of hot soup, lying on the table.
b. Cooking vegetables in a pan.
c. Melting of a chocolate bar, in the school bag, on a hot day
d. Cooking food in a microwave oven
(a) A paper cup, full of hot soup, lying on a table - Convection
Here convection happens between the siup and surrounding air.
(b) Cooking vegetables in a pan- Conduction
The pan, which is in direct contact with the heat source, transfers the heat to the vegetables.
(c)- Melting of a chocolate bar, in the school bag, on a hot day- Conduction
Conduction of heat takes place from the bag which is in direct contact with chocolate.
(d) Cooking food in a microwave oven- Radiation
Here there's no direct contact between the heat source and object. So it is radiation
Updated on: 10-Oct-2022
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