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. the uppermost vane passes the inlet port, sealing it off from the gas being pumped. compression. further rotation compresses and heats the gas ahead of the lowermost vane, reducing its volume due to the decreasing space between the rotor and stator. exhaust. as the lowermost vane continues its rotation...
molecules) and those that indirectly measure pressure by measuring properties of gases that vary with pressure. indirect gauges must be calibrated (i.e. have their readings adjusted) based on the actual gas present. their readings are, therefore "gas type dependent". direct gauges are used in the low...
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