changed
from one form to another, but it is neither created nor
destroyed.&quot; This seems simple enough to understand.
Underneath the surface, however, there is an assumption that this
also means that energy will not spontaneously appear or disappear
from the system. This is also a necessary condition if <b>conservation</b>
of energy is to be satisfied LOCALLY as well as UNIVERSALLY.</font></p>

<p><font size="3">This discussion becomes relevant, for instance,
in describing the operation of the r