Vacuum - Examples


pressure (Pa) pressure (Torr) mean free path molecules per cm3
Standard atmosphere, for comparison 101.325 kPa 760 66 nm 2.5×1019
Vacuum cleaner approximately 80 kPa 600 70 nm 1019
liquid ring vacuum pump approximately 3.2 kPa 24 1.75 μm 1018
Mars atmosphere 1.155 kPa to 0.03 kPa (mean 0.6 kPa) 8.66 to 0.23
freeze drying 100 to 10 Pa 1 to 0.1 100 μm to 1 mm 1016 to 1015
rotary vane pump 100 Pa to 100 mPa 1 to 10−3 100 μm to 10 cm 1016 to 1013
Incandescent light bulb 10 to 1 Pa 0.1 to 0.01 1 mm to 1 cm 1015 to 1014
Thermos bottle 1 to 0.01 Pa 10−2 to 10−4 1 cm to 1 m 1014 to 1012
Earth thermosphere 1 Pa to 100 nPa 10−2 to 10−9 1 cm to 100 km 1014 to 107
Vacuum tube 10 µPa to 10 nPa 10−7 to 10−10 1 to 1,000 km 109 to 106
Cryopumped MBE chamber 100 nPa to 1 nPa 10−9 to 10−11 100 to 10,000 km 107 to 105
Pressure on the Moon approximately 1 nPa 10−11 10,000 km 4×105
Interplanetary space 10
Interstellar space 1
Intergalactic space 10−6

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