Q7. Determine the specific volume of superheated water vapour at 3.5 MPa and 450oC based on: (a) the steam tables, (b) the ideal-gas equation, and (c) the generalized compressibility chart. Determine the error involved in the last two cases.​​​For water, the temperature and pressure at the critical point are Tcr = 647.1K and Pcr =22.06 MPa​SP21, AY2020-2021

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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.