A horizontal copper plate (k= 374 W/m °C,  = 11.23x 10-5 m2/s) 10 cm thick is initially uniform in temperature at 250 °C. The bottom surface of the plate is insulated. The top surface is suddenly exposed to a fluid stream at 80 °C. The convection heat transfer coefficient is 935 W/m2 °C. What are the temperatures at the top surface (Tt) and bottom surface (Tb) after 6 minutes?

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Units and Dimensions

Dimensions are the basic concepts of the measurement of quantities. Units are the means of expressing the dimensions. For instance, an area has a dimension of L2 and a unit of m2.