UNITS AND MEASUREMENT - NCERT

CHAPTER TWOUNITS AND INTRODUCTIONM easurement of any physical quantity involves comparisonwith a certain basic, arbitrarily chosen, internationallyaccepted reference standard called unit . The result of ameasurement of a physical quantity is expressed by anumber (or numerical measure) accompanied by a the number of physical quantities appears to bevery large, we need only a limited number of UNITS forexpressing all the physical quantities , since they are inter-related with one another. The UNITS for the fundamental orbase quantities are called fundamental or base UNITS . Theunits of all other physical quantities can be expressed ascombinations of the base UNITS . Such UNITS obtained for thederived quantities are called derived UNITS . A complete setof these UNITS , both the base UNITS and derived UNITS , isknown as the system of THE INTERNATIONAL SYSTEM OF UNITSIn earlier time scientists of different countries were usingdifferent systems of UNITS for MEASUREMENT .

units of all other physical quantities can be expressed as combinations of the base units. Such units obtained for the derived quantities are called derived units. A complete set of these units, both the base units and derived units, is known as the system of units.

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  Measurement, Unit, Physical, Quantities, Physical quantities

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