It seems like creating a vacuum should be a pretty easy job, but it turns out that sucking all the air out of something is harder than it seems. A cheap vacuum pump will get you part of the way there, ...

IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. Vapor diffusion pumps developed from ...

REPORTING recently on the vacuums produced by diffusion pumps, Ray and Sengupta 1 quote my statement "that the limit of pumping is set at the vapour pressure of the pump fluid at room temperature" and ...