Air enters a two-stage compressor at 100kpa and 27 C and is compressed to 900kpa. The pressure ratio across each stage is the same and the air is cooled to the initial temperature between the two stages. Assuming the compression process to be isentropic, determine the power input for a mass flow rate of 0.03kg/s. what would the power input be if only one stage of compression was used?

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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.