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The 21 pages that link to Vacuum, each with the reason it gives.

• Atmospheric pressureCompared with: Vacuum measurements describe pressure deficits relative to atmospheric conditions.

• Electron microscopyRelated: Most electron microscopes require vacuum so electrons travel without frequent collisions with gas molecules.

• Electron microscopeRelated: Low pressure lets electrons travel through the instrument without frequent collisions.

• Transmission electron microscopyRelated: Vacuum prevents air molecules from scattering the electron beam.

• FlywheelRelated: High-speed storage flywheels use vacuum enclosures to reduce aerodynamic drag.

• Scanning electron microscopyRelated: The electron beam must travel through low-pressure space without excessive scattering by gas molecules.

• Vacuum pumpNarrower topic: A pump creates or maintains this reduced-pressure condition.

• Compressed airCompared with: Vacuum systems use pressure differences in the opposite direction from compressed-air systems.

• Scanning electron microscopeRelated: A low-pressure column lets electrons travel without frequent collisions with gas molecules.

• Space suitRelated: The suit must prevent bodily fluids and gases from escaping into near-vacuum.

• Molecular beamNarrower topic: Molecular beams require sufficiently low pressure to preserve directed travel.

• Evangelista TorricelliRelated: The space above the mercury in Torricelli’s tube challenged the claim that nature could not contain a void.

• Absolute pressureCompared with: Vacuum-pressure scales may report a deficit from atmosphere rather than absolute pressure itself.

• Alexei LeonovRelated: The vacuum caused Leonov’s spacesuit to expand and stiffen.

• Water pressureCompared with: A sufficiently low pressure can oppose water supply or cause dissolved gases to emerge.

• Space manufacturingRelated: Space vacuum can support processing but also causes outgassing and material loss.

• Denis PapinRelated: Condensing steam inside a cylinder could create low pressure and let atmospheric pressure move a piston.

• Outer spaceRelated: Space has extremely low particle density but is not an absolute vacuum.

• Millimetre of mercuryRelated: Vacuum readings can use mmHg, but may instead report absolute pressure or pressure difference.

• Otto von GuerickeNarrower topic: Guericke’s experiments investigated how removing air changes the behavior of enclosed spaces.

• Electron techniquesRelated: Low pressure lets electrons travel through instrument columns without excessive gas collisions.