Saturated Liquid vs Compressed Liquid
Saturation and compression are important physical properties of any liquid. As compared to solids, the inter-molecular spaces in liquids are large which implies that they can be compressed by applying pressure. On the other hand saturation refers to a point when no more solute can be added to the liquid. When more pressure is applied on a liquid in addition to the atmospheric pressure, it tends to compress as there are empty spaces between the molecules. There are differences between a saturated liquid and compressed liquid that are briefly described below.
Some conditions that are required to be met for a liquid to be classified as a compressed liquid are as follows.
• Its specific volume should be less than the specific volume of that liquid when saturated
• Its temperature should be below the saturation temperature
• Its pressure should be more than its saturation pressure
• Enthalpy (sum of internal energy and the product of the pressure and volume) of the compressed liquid must be less than the enthalpy of the saturated liquid
Whenever we talk of a compressed liquid, we imply that their pressure is greater than their saturation pressure at any given temperature. In general, a compressed liquid can be considered as a saturated liquid at a given temperature.
It is defined as a liquid whose temperature and pressure are such that if you try to decrease the pressure without changing the temperature, the liquid begins to boil. Another way of defining it is in terms of it’s inter molecular spaces. Here it is defined as a solution that contains enough of another solid, liquid or gas in such a manner that no more of a solid, liquid or gas will dissolve in the solution at a given temperature and pressure.