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Which of the following is a correct description of the high/ultrahigh vacuum condition? mean free paths are smaller than the manifold dimensions viscous flow

Which of the following is a correct description of the high/ultrahigh vacuum condition? mean free paths are smaller than the manifold dimensions viscous flow regime is in effect can either be turbulent or laminar more particles in chamber walls than in the space between manifolds Reynolds number less than 1200 and Knudsen number less than 0.001

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