A cup of hot chocolate has temperature  80 ° C  in a roomkept at 20 ° C. After half an hour the hot chocolate cools to 60 ° C.(a) What is the temperature of the chocolate after anotherhalf hour?(b) When will the chocolate have cooled to 40 ° C?

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Mechanisms of heat transfer

Heat transfer is an essential discipline in thermal engineering that deals with the transfer, conversion, usability, and creation of heat or thermal energy. Transfer of heat occurs through various mechanisms like conduction, convection, radiation, and change of phases. All these mechanisms have distinct characteristics, but these mechanisms can simultaneously occur in an identical system.