 and conversely, by the
expenditure of an equal quantity of work, an equal quantity of
heat is produced.&quot; This statement by Carnot was based on
hundreds of experimental measurements. After such convincing
experimentation, it was not unreasonable for Clausius to conclude
that heat could be converted into mechanical work. It was,
however, a theoretical leap of logic to conclude that energy, in
general, could be changed from one form to another.</font></p>

<p><font size="3">Before we go on, it i