Question: An engineer for an insulation company is testing different materials in an apparatus that consists of two large parallel flat plates spaced 5 cm apart.

An engineer for an insulation company is testing different materials in an apparatus that consists of two large parallel flat plates spaced 5 cm apart. The inside surfaces of the plates are maintained at 0^oC and 20^oC respectively (to simulate a mild winter day). The engineer tries three different materials between the plates (a) stagnant carbon dioxide, (b) water, and (c) common red brick. What are the rate and direction of heat transfer per unit area in each case? Which material is the most effective insulator?

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