  
Inkjet Printers are usually inexpensive, quiet, reasonably fast, and many models can produce high quality output.
Most current inkjets (Epson being a notable exception) work by having a print cartridge with a series of tiny electrically-heated chambers constructed by photolithography. To produce an image, the printer runs a pulse of current through the heating elements. A steam explosion in the chamber forms a bubble, which propels a droplet of ink onto the paper (hence Canon's tradename for its inkjets, bubblejet). When the bubble condenses, surplus ink is sucked back up from the printing surface. The ink's surface tension pumps another charge of ink into the chamber through a narrow channel attached to an ink reservoir. Epson's Micro Piezo technology uses a piezo crystal in each nozzle instead of a heating element. When current is applied, the crystal bends, forcing a droplet of ink from the nozzle.
Older ink jet printers directed ink streams electrostatically or piezoelectrically; ultrasound was used to induce waves in the ink, which then broke into little droplets that would fall on the right place on the page.
Ink bleeding may result on some types of paper.
Because the ink used in most inkjets is water-soluble, care must be taken with inkjet-printed documents to avoid even the smallest drop of water, which can cause severe "blurring" or "running." Also, highlighter markers cannot be used with such documents.
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