Respuesta :

The SI system, also called the metric system, is used around the world. There are seven basic units in the SI system: the meter (m), the kilogram (kg), the second (s), the kelvin (K), the ampere (A), the mole (mol), and the candela (cd).
They use SI as a simpler form of data... like as a reference, so they can add to the list, when they find different values. hoped it helped