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CGS System
CGS System, also centimeter-gram-second system (usually written “cgs system”), a metric system based on the centimeter (c) for length, the gram (g) for mass, and the second (s) for time. It is derived from the meter-kilogram-second (or mks) system but uses certain special designations such as the dyne (for force) and the erg (for energy). It has generally been employed where small quantities are encountered, as in physics and chemistry.
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Atomic clock, electric or electronic timekeeping device that is controlled by atomic or molecular oscillations. A timekeeping device must co...
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. Vacuum Tubes, electronic devices, consisting of a glass or steel vacuum envelope and two or more electrodes between which electrons can mo...
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. Evolution, in biology, complex process by which the characteristics of living organisms change over many generations as traits are passed ...