What could be the heat flow if the heat passes through a rectangular solid with a thickness of 500 mm wherein heat came from the region with 33 °C and goes to a region with 20 °C? Said rectangular solid has a length of 2.5 m and height of 4 m and its thermal conductivity is known to be 401 J/s m°C.
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area or through a small surface area?
An object with a wider area has more surface particles working to conduct heat. As such, the rate of heat transfer is directly proportional to the surface area through which the heat is being conducted.
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