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% Verbal description for system Poly (Poly_desc.tex)
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% %% Revision 1.1 1998/03/26 15:13:35 peterg
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The acausal bond graph of system \textbf{Poly} is
displayed in Figure \Ref{Poly_abg} and its label
file is listed in Section \Ref{sec:Poly_lbl}.
This four-port component computes the tempertature following a
polytropic expansion using:
\begin{equation}
T_2 = T_1 \left ( \frac{P_2}{P_1} \right )^\alpha
\end{equation}
where $\alpha = \frac{n-1}{n}$ and $n$ is the coefficient of
polytropic expansion.
The output is \emph{bicausal} and also imposes a zero flow. This is
implemented using the bicausal \textbf{SS} component labeled ``zero''.