An overhead 15-m-long, uninsulated industrial steam pipe of 135 -mm diameter is routed through a building whose walls and air are at 23° C. Pressurized steam maintains a pipe surface temperature o 209°C, and the coefficient associated with natúral convection is h = 13 W/m2 -K. The surface %3D emissivity is 0.5. What is the rate of heat loss from the steam line in Watts. 23.732

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Properties of Pure Substances

A substance with fixed chemical composition throughout is called a pure substance like water, air, and nitrogen. A pure substance does not have to be a single element or compound. A mixture of two or more phases of a pure substance is also a pure substance as long as the chemical composition is the same for all phases. These substances mainly have a constant/ uniform composition. The substances also have fixed boiling and melting points. A pure substance takes part in a chemical reaction to form predictable products.