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In theoretical studies, it is often convenient to consider the simplest kind of thermodynamic system.
This is defined variously by different authors.
For the present article, the following definition will be convenient, as abstracted from the definitions of various authors.
A region of material with all intensive properties continuous in space and time is called a phase.
A simple system is for the present article defined as one that consists of a single phase of a pure chemical substance, with no interior partitions.

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