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. 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 .
UNITS AND MEASUREMENT 17 * The values mentioned here need not be remembered or asked in a test. They are given here only to indicate the extent of accuracy to which they are measured. With progress in technology, the measuring techniques get improved leading to measurements with greater precision. The definitions of base units are revised to ...
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