User:Krubo/sandbox

SI is the modern form of the metric system, and is currently the most widely used system of measurement. SI defines units of measurement built on 7 base units. Prior to 2019, only the base units second, metre, and kelvin were defined purely in terms of natural phenomena. The base unit kilogram was still defined by a physical prototype, and the base units mole, candela and ampere were defined in ways that depended on the definition of the kilogram. Moreover, the natural phenomena used to define the kelvin and the ampere were difficult to measure with the desired degree of precision. As of 2019, all base units will be defined in terms of natural phenomena that can currently be measured with a high degree of precision.

/* Nur Jahan */ rv deletions made on |29 November 2015

/* Nur Jahan */ rv deletions made on

/* Nur Jahan */ rv deletions made on 29 November 2015

/* Nur Jahan */ rv deletions made on 29 November 2015

reference test

and here's some extra text??

Reference test using citation and contribution