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We added fitted a line to each of the runs to see the rate of change of the water level inside the bubble collector when water runs through the sand filter. The value of the linear fit is very close to 1, indicating that the data can be modeled accurately using a linear relationship. Figure 2. and Figure 3. show the linear fit line for the second data collection period, and more detailed graphs can also can be found here.
The calculations for the amount of gas removed during each data collection periods gave us the results summarized in Table 1. and Figure 4.: