1A. Suppose you have a system of water at 3 bar and 160°C and want to determine the specific volume. Draw the P-v diagram being sure to label the axes, label lines and appropriate saturation values, and show your specific point. What phase is your system? State what the specific volume is_ If the pressure was 2 bar at the same temperature, would v increase or decrease?

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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.