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measurment
Physics is the science of objective observation and measurement.Measurement  is the assignment of numbers to objects or events. It is a cornerstone of most natural science , technology,economics and quantitative research  in other social sciences. Measurements are most commonly made in the SI system, which contains seven  fundamental units: kilogram, metre,candela,second,ampere,kelvin and mole.Six of these units are artifact-free (defined without reference to a particular physical object which serves as a standard).


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