What Mean Free Path, when Vacuum Range "medium vacuum"?
Vacuum range Pressure in hPa (mbar) Molecules / cm 3 Molecules / m 3 Mean free path
Mean free path
170097
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2-170097-1
Mean free path in kinetic theory
Mean free path in kinetic theory
Ambient pressure 1013 2.7 × 10 19 2.7 × 10 25 68 nm
Low vacuum 300 – 1 10 19 – 10 16 10 25 – 10 22 0.1 – 100 μm
Medium vacuum 1 – 10 −3 10 16 – 10 13 10 22 – 10 19 0.1 – 100mm
High vacuum 10 −3 – 10 −7 10 13 – 10 9 10 19 – 10 15 10cm – 1km
Ultra high vacuum 10 −7 – 10 −12 10 9 – 10 4 10 15 – 10 10 1km – 10 5 km
Extremely high vacuum <10 −12 <10 4 <10 10 >10 5 km
SELECT Mean free path FROM table WHERE Vacuum range = medium vacuum
medium vacuum