A general definition of the source and sink concept is based on net flows between the components of a system: a source is a subsystem or element that is a net exporter of some resource and a sink is a net importer of these resources.
A general definition of the source and sink concept is based on net flows between the components of a system: a source is a subsystem or element that is a net exporter of some resource and a sink is a net importer of these resources.