Pressurized gas

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

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.

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