About the Book
Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pages: 72. Chapters: Vacuum tube, Vacuum pump, Pressure measurement, Chemical vapor deposition, Turbopump, Vacuum flask, Cold cathode, Outer space, Manifold vacuum, Dirac sea, Ultra-high vacuum, Virtual Institute of Nano Films, Helium mass spectrometer, Beamline, Vacuum flange, Hot filament ionization gauge, Outgassing, Vacuum deposition, Molecular sieve, Vacuum coffee maker, Vacuum chamber, Suction cup, Vacuum packing, Aspirator, McLeod gauge, Vacuum furnace, Thin-film thickness monitor, Vacuum evaporation, Frans Michel Penning, Bell jar, Vacuum cementing, Vacuum consolidation, Roughing pump, Bake-out, Jet aerators, Thermal vacuum chamber, Nilfisk CFM, Foreline, Vacuum grease, Non-Evaporable Getter, Vacuum induction melting. Excerpt: In electronics, a vacuum tube, electron tube (in North America), or thermionic valve (elsewhere, especially in Britain), reduced to simply "tube" or "valve" in everyday parlance, is a device that relies on the flow of electric current through a vacuum. Vacuum tubes may be used for rectification, amplification, switching, or similar processing or creation of electrical signals. Vacuum tubes rely on thermionic emission of electrons from a hot filament or cathode, that then travel through a vacuum toward the anode (commonly called the plate), which is held at a positive voltage relative to the cathode. Additional electrodes interposed between the cathode and anode can alter the current, giving the tube the ability to amplify and switch. Vacuum tubes were critical to the development of electronic technology, which drove the expansion and commercialization of radio communication and broadcasting, television, radar, sound reproduction, large telephone networks, analog and digital computers, and industrial process control. Although some of these applications had counterparts using earlier technologies, such as th...
