What is substance in thermodynamics ?

In thermodynamics a working substance is defined as a fluid (liquid or gas) in which energy can be stored, removed or transferred through.
Example Air in IC engine, steam in boiler, water in hydraulic turbine.

Pure substance

A pure substance needs to be –
1.  Homogeneous in composition (i.e. single chemical species)
      2.  Homogeneous and invariable in chemical aggregation (i.e. chemically stable)

What is substance in thermodynamics
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