Question: Air at 1 atm is contained between two concentric spheres having diameters of 10 and 8 cm and maintained at temperatures of 300 and 400

Air at 1 atm is contained between two concentric spheres having diameters of 10 and 8 cm and maintained at temperatures of 300 and 400 K. Calculate the free-convection heat transfer across the air gap.

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