A 5.0 -cm-diameter aluminum cylinder is maintained at a temperature of 50-C in a large room where the air and wall temperature are at 20-C. The surface emissivity of the aluminum may be taken as 0.8 and the heat-transfer coefficient equal 6.5 W/m. C, caleulate the total heat lost by the pipe per unit length. (Stefan-Boltrmann constant = 5.669 x 10)

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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.