Compressed fluid

A p-v diagram for liquid water. The compressed fluid region is located to the left of the blue line (the liquid-vapor phase boundary).
The international pictogram for compressed gases.

A compressed fluid (also called a compressed or unsaturated liquid,[1] subcooled fluid or liquid) is a fluid under mechanical or thermodynamic conditions that force it to be a liquid.[2]

At a given pressure, a fluid is a compressed fluid if it is at a temperature lower than the saturation temperature. This is the case, for example, for liquid water at atmospheric pressure and room temperature. In a plot that compares pressure and specific volume (commonly called a p-v diagram), compressed fluid is the state to the left of the saturation curve.

Conditions that cause a fluid to be compressed include:

The term compressed liquid emphasizes that the pressure is greater than the saturation pressure for the given temperature. Compressed liquid properties are relatively independent of pressure.


  1. Rogers, Gordon; Mayhew, Yon (1992). Engineering Thermodynamics (4 ed.). Longman Scientific & Technical. ISBN 0582045665.
  2. Çengel, Yunus A.; Boles, Michael A. (2001). Thermodynamics: An Engineering Approach (4 ed.). McGraw-Hill Education. p. 65. ISBN 978-0071216883.
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