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  2. Vacuum pump - Wikipedia

    en.wikipedia.org/wiki/Vacuum_pump

    The Roots blower is one example of a vacuum pump. A vacuum pump is a type of pump device that draws gas particles from a sealed volume in order to leave behind a partial vacuum. The first vacuum pump was invented in 1650 by Otto von Guericke, and was preceded by the suction pump, which dates to antiquity. [1]

  3. Turbomolecular pump - Wikipedia

    en.wikipedia.org/wiki/Turbomolecular_pump

    A turbomolecular pump with attached vacuum ionization gauge for pressure measurement.. At atmospheric pressure, the mean free path of air is about 70 nm. A turbomolecular pump can work only if those molecules hit by the moving blades reach the stationary blades before colliding with other molecules on their way.

  4. The 7 Best Cordless Handheld Vacuum Cleaners on Amazon - AOL

    www.aol.com/7-best-cordless-handheld-vacuum...

    2. Bissell Handheld Vacuum. Most Powerful . While we could give a standing ovation to this vacuum’s 50,000-watt suction and pet hair cleaning capabilities alone, we’d say its motor-powered ...

  5. Pressure measurement - Wikipedia

    en.wikipedia.org/wiki/Pressure_measurement

    A vacuum gauge is used to measure pressures lower than the ambient atmospheric pressure, which is set as the zero point, in negative values (for instance, −1 bar or −760 mmHg equals total vacuum). Most gauges measure pressure relative to atmospheric pressure as the zero point, so this form of reading is simply referred to as "gauge pressure".

  6. This bestselling 'lightweight but sturdy' Shark vacuum is ...

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    Shark Wandvac Cord-Free Handheld Vacuum . $89 $116 Save $27. See at Walmart. Bissell Little Green Portable Carpet Cleaner. $98 $102 Save $4. See at Walmart. Tech. Acer Chromebook 315. $139 $179 ...

  7. Cryopump - Wikipedia

    en.wikipedia.org/wiki/Cryopump

    A cryopump or a "cryogenic pump" is a vacuum pump that traps gases and vapours by condensing them on a cold surface, but are only effective on some gases. The effectiveness depends on the freezing and boiling points of the gas relative to the cryopump's temperature.

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