Source: Image of Physical Phenomenon, Public Domain, http://en.wikipedia.org/wiki/File:CollageFisica.jpg
A system which is unable to receive new energy from outside itself.
In science, a loss of energy; in human systems, the tendency of a system to become disorganized and less efficient due to gradual energy loss within the system.
The property of a system, which keeps it balanced, stable, or not subject to change.
In science, exported entropy from a system which keeps internal entropy low; in human systems, the tendency of a system to become better organized, improving or maintaining capacity and efficiency.
A system which is able to receive new energy from outside itself.