ME 201 Thermodynamics
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ME 201
Thermodynamics
Compressible Substance Property Evaluation Guide
Substances that are undergoing a phase change or have the potential to undergo a
phase change must be considered compressible substances. Occasionally, we can
identify these types of substances by clue words that are used, such as: boiling,
condensation, steam, saturated, vapor, water, and refrigerant.
Properties for compressible substances must be obtained form tabular data.
Normally, the property data is organized into four tables
Saturation Pressure Table
Saturation Temperature Table
Superheated Vapor Table
Compressed Liquid Table
In order to use the correct table, it is essential that the fluid phase be identified.
We recognize five fluid phases
Subcooled or Compressed Liquid
Saturated Liquid
Two Phase Mixture with a quality, x, given as the fraction of vapor in the mixture
Saturated Vapor
Superheated Vapor
