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The data from this experiment shows that under partial vacuum and slight aeration the dissolved oxygen content changes by about – once the apparatus is open to atmospheric conditionsthere was a problem with bubbles forming on the DO probe. This is indicated by the sharp dips in the data which corresponds to a bubble rising off of the DO probe. Overall there was not much change in the DO over time but we found the DO probe to be unreliable when it was pressurized and was further complicated by there almost constantly being bubbles on the probe.