# Compressed fluid

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{{Short description|Fluid under thermodynamic or mechanical conditions which force it to be a liquid}}
[[File:P-v plot.png|300x300px|thumb|A [p-v diagram](/source/Pressure_volume_diagram) for liquid water. The compressed fluid region is located to the left of the blue line (the liquid-vapor phase boundary).]]
[[File:GHS-pictogram-bottle.svg|thumb|The [international](/source/Globally_Harmonized_System_of_Classification_and_Labeling_of_Chemicals) [pictogram](/source/GHS_hazard_pictograms) for compressed gases.]]

A '''compressed fluid''' (also called a '''compressed''' or '''unsaturated liquid''',<ref>{{Cite book|title=Engineering Thermodynamics|last=Rogers|first=Gordon|last2=Mayhew|first2=Yon|publisher=Longman Scientific & Technical|year=1992|isbn=0582045665|edition=4}}</ref> '''subcooled fluid''' or '''liquid''') is a [fluid](/source/fluid) under [mechanical](/source/Fluid_mechanics) or [thermodynamic conditions](/source/thermodynamics) that force it to be a [liquid](/source/liquid).<ref>{{Cite book|title=Thermodynamics: An Engineering Approach|last=Çengel|first=Yunus A.|last2=Boles|first2=Michael A.|publisher=McGraw-Hill Education|year=2001|isbn=978-0071216883|edition=4|pages=65}}</ref>

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

Conditions that cause a fluid to be compressed include:
* Specific volume and [enthalpy](/source/enthalpy) inferior to that of a [saturated liquid](/source/saturated_liquid);
* Temperature below the [saturation temperature](/source/saturation_temperature);
* Pressure above the [saturation pressure](/source/saturation_pressure).

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.

== References ==
{{Reflist}}

{{Portal bar|Physics}}

Category:Fluid dynamics
Category:Gases

{{fluiddynamics-stub}}

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Adapted from the Wikipedia article [Compressed fluid](https://en.wikipedia.org/wiki/Compressed_fluid) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Compressed_fluid?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.