Transcription of UNITS AND MEASUREMENT - NCERT
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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.
Amount of mole mol The mole is the amount of substance of a system, which contains substance as many elementary entities as there are atoms in 0.012 kilogram of carbon - 12. (1971) Luminous candela cd The candela is the luminous intensity, in a given intensity direction, of a source that emits monochromatic radiation of
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