Formulae on Physical World And Measurement


The measuring process is a comparison process. We select the unit of measurement (u) and find number of times (n) this unit is contained in the quantity (P). Then P = n u. The magnitude of a physical quantity is always constant. However its numerical value (n) changes with the system of units.

The order of magnitude of a quantity gives us a value nearest to the actual value of the quantity in suitable powers of 10. For this, a number less than 5 is treated as 1 and a number between 5 and 10 is treated as 10.

The metre has recently (1983) been defined as the distance covered by the light in (1/299792485)th part of second.

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