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\section{Data and Analysis}  \subsection{First Sound}  First to plot $c_1$, the frequencies can be $c_1$,frequencies were  found from the recorded data at various pressures. The frequencies and the sound speed are related by $f=\frac{c_1n}{2L}$ and solving for results in \[c_1=\frac{f2L}{n}\] where L=0.0495 meters and choose n=1. Pressure data was taken from in torr and converted into temperatures in kelvin using a Maynard Table.   Temperatures were taken then from 1.3 K to 2.0 kelvin in .02 K temeperature steps then 2.0 to 2.18 Kelvin in .01 K temperature steps.