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एक्सप्लेन द डिफरेंट सिस्टम ऑफ यूनिटी यूज्ड फॉर द मेजरमेंट​

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A UNIT of MEASUREMENT is a definite magnitude of a quantity, defined and adopted by convention or by law, that is used as a standard for measurement of the same kind of quantity.[1] Any other quantity of that kind can be expressed as a multiple of the unit of measurement.[2] For example, a length is a physical quantity. The metre is a unit of length that represents a definite predetermined length. When we say 10 metres (or 10 m), we ACTUALLY mean 10 times the definite predetermined length called "metre". Measurement is a process of determining how large or small a physical quantity is as compared to a basic reference quantity of the same kind.

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