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Thermal Engineering by Sukumar Pati, Sadhu Singh

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Chapter 2

Properties of Steam

2.1 ❐ PURE SUBSTANCE

A pure substance may be defined as a system that has the following characteristics:

  1. Homogeneous in composition: It means that the composition of every part of the system is same throughout. By composition, we mean the relative proportions of the chemical elements into which the sample of the system can be analysed.
  2. Homogeneous in chemical aggregation: It means that the chemical elements must be combined chemically in the same way in all parts of the system.
  3. Invariable in chemical aggregation: It means that the state of chemical combination of the system does not change with time and position.

Examples of pure substance are atmospheric air, mixture of steam-water, combustion products of ...

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