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19 Topic Pages Found in Technology and starting with the letter P
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Open particle detector
particle detector

in physics, device for detecting, measuring, and analyzing particles and other forms of radiation entering it. Such devices play an important role not

Personal Computer

(PC), small but powerful computer primarily used in an office or home without the need to be connected to a larger computer. PCs evolved after the

petrol engine

The most commonly used source of power for motor vehicles, introduced by the German engineers Gottlieb Daimler and Karl Benz in 1885. The petrol


( fär'mĭng ), the use of genetically altered livestock, such as cows, goats, pigs, and chickens, to produce medically useful products. In pharming,


process whereby written or printed matter is directly copied by photographic techniques. Generally, photocopying is practical when just a few copies

Open Photography

science and art of making permanent images on light-sensitive materials. The camera itself is based on optical principles known at least since the age

Plastic surgery

surgical repair of congenital or acquired deformities and the restoration of contour to improve the appearance and function of tissue defects.


Coating a metal or other material, such as plastic or china, with a hard, nonporous metallic surface to improve durability and beauty. Early plated

player piano

Mechanical piano designed to reproduce key actions recorded on a perforated paper roll. The hammers are made to touch the strings not by action of the


piping systems inside buildings for water supply and sewage. The Romans had a highly developed plumbing system; water was brought to Rome by aqueducts