particle liable to change the surface finish

component which may set the fluid in motion or be activated by the fluid during operation, for example pump, cylinder, distributor, injector, valve regulator

two or more particles which are in intimate contact and cannot be separated by gentle stirring and the small shear forces thus generated

continuous and/or irregular movement of a component

contaminants that are found in the atmosphere surrounding the component

automatic light extinction particle counter APC counter that works on the light extinction principle