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For second sound, the process of increasing temperature by increasing pressure was used as in first sound. All the pressures were then converted to temperatures as in first sound using a Maynard Table and temperatures were measured from 1.3 K to 2.12 K. TThe equation used to find the sound speed is  \[c_2=\frac{f2L}{n}\]  where n is an integer. For each data file taken for the frequencies of second sound, four resonances that were more defined were used for each data file up until 2.12 K where after this temperature the frequencies werent clearly defined.   These frequencies correspond to mode number n, and n was found to go from n=3,4,5,6. The second sound was then computed for each mode number and then the average of these were used for analysis. Figure 7 displays the data for the second sound velocity vs temperature.