Compressibility: The change in volume of a unit volume of a fluid when subjected to a unit change of pressure.
Contaminant: Any material or substance that is unwanted or adversely affects the fluid power system or components or both.
Corrosion: The chemical change in the mechanical elements caused by the interaction of fluid or contaminants or both. More specifically related to chemical changes in metals. The products of change may be introduced into the system as generated particulate contamination.