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We need to measure physical quantities to know their mass
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Physical quantity is defined as a property of a body/object/substance that can be quantified(valuating) by measurement.
why v need this physical measurement is to have a universal standard set of values eg 1kg is 1000 g / 1 liter is 1000ml
 there are 2 type of quantities 1\ extensive quantity 2\intensive quantity  
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