s important, for our
purposes, to be reminded that this new idea expressed as the
&quot;First Law of Thermodynamics&quot; consists of a number of
overlapping ideas and assumptions that can be expressed as
follows:</font></p>

<p><font size="3">1) Perpetual motion machines are impossible</font></p>

<p><font size="3">2) The nature of heat is reduced to the random
motions of molecular matter</font></p>

<p><font size="3">3) Energy can be changed from one form to
another without any explanation as 