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[QUOTE=funola;3608741]Would you know if I run two vacuum pumps in series, would I be able to achieve lower vacuum levels than a single pump? .......................................................[UNQUOTE]
I would say no. Both pumps do the same thing so very low vacuum of 1 torr or better would not be attained. Even lab' rated vac' pumps only pull down to 5 torr.
You need very specialized ( read : Expensive.) equipment to pull a near pure vacuum.
I would say that is is impossible to pull a pure vacuum.
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