Heat is conducted through the wall the outside of the wall


The concrete wall of a building is 0.147 m thick. The temperature inside the building is 22.4 °C, while the temperature outside is 0.0 °C. Heat is conducted through the wall. The outside of the wall loses the energy only due to radiation. What is the emissivity of the wall?

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Physics: Heat is conducted through the wall the outside of the wall
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