A compressed fluid (also called a subcooled fluid or subcooled liquid) is a fluid under mechanical and or thermodynamic conditions that force it to be a liquid. It is a liquid at a temperature lower than the saturation temperature at a given pressure. In a plot that compares absolute pressure and specific volume (commonly called a P-v diagram), of a real gas, a compressed fluid is to the left of the liquid-vapor phase boundary; that is, it will be to the left of the vapor dome.