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We believe the following to be sources of error:
Human error:
Despite our best attempt at being consistent (by measuring and marking heights on the test tube, while also holding a ruler on the test tube wall), there will always be human error in observing the bed expansion visually.
Fix:The next expansion experiment should use a camera so there is record of the heights at each flow rate, and also tape a ruler to the filtration bed wall, rather than holding the ruler or drawing it on.
Wall Friction:
We can attribute the increase in error as flow rate increased due to the increase in wall friction on the test vial.
Fix:We can minimize the wall and tube friction by increasing the size of our bench scale experiments.
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