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\subsection{Determining P}  The porosity,P, is found by using the equation \[ n=\sqrt{2-P}\] \\  Recall that n was found in correction $c_4$ as $n=1.2385$ and with some algebra it is found that $P=2-n^2=0.466$. \Subsection{Error in n and P}  Error in n is found by the equation   \[ dn= \sqrt{\frac{\rho_s}{\rho}}\sqrt{(\frac{1/c_4})^2 dc_1^2 + (\frac{-c_1/c_4^2})^2} dc4^2};