Vacuum range | Pressure in mbar | Molecules/cm3 | Mean free path |
Ambient pressure | 1013.25 | 2.7 × 1019 | 68 nm |
Low vacuum | 300...1 | 1019...1016 | 0.1 µm...100 µm |
Medium vacuum | 1...10−3 | 1016...1013 | 0.1 mm...100 mm |
High vacuum | 10−3...10−7 | 1013...109 | 100 mm...1 km |