ectual
overlay </i>of Helmholtz and Clausius, on this experimental work,
where the problems are introduced. The theory of <b>conversion</b>
and the ideas about the nature of heat will be taken up again
later in this article, after more ground work has been laid.</font></p>

<p><font size="3">The &quot;Second Law of Thermodynamics&quot;
evolved out of further studies of the behavior of heat in closed
systems. Remarkably, there is no one statement that is
universally recognized as the definitive expr