Fridge compressor as a vacuum pump? Measuring the vacuum.

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Today I was trying to build a DIY vacuum pump from a fridge compressor. I tried to measure the vacuum it can pull. I also tried to chain two fridge compressors (put them in series) to see if this can create a better vacuum. I reached about 80 mbar (8 kPa) vacuum with one compressor and 40 mbar (4 kPa) with 2 compressors (the discharge of one goes into the suction of the other).
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