sTEm–at-Work Puzzle #39: Vacuum Pump Performance

The technician that works in the semiconductor, micro-electromechanical system and nano technologies manufacturing sector must work with various pressure ranges that are below atmospheric pressure. A technician experienced in vacuum technology is reviewing previous test data conducted on a single stage vacuum pump and a two-stage vacuum pump that she is now responsible for. The tech expects the two-stage pump to “pull” a better vacuum that a single stage pumps. That same technician also understands the concepts of outgassing and a vacuum leak.  The tech is very knowledgeable, understands the operation of the pumps under test and has reviewed the data plots shown below very carefully.    

Does the technician suspect that the performance data recorded below is mislabeled.Yes or NO. Join the discussion and submit your answers below the blog post, or on     


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