What is the role of the fin(s) in heat transfer? What is the definition of fin efficiency? What are the differences between heat transfer by conduction and heat transfer by convection?

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Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.