By multiplication or division by some power of 10 .
International System of Units (SI)
SI is the Systeme Internalionale of measurement in which the Metre, kilogram and Second are some primary units. An older system based on metric units used centimetre, gram, and second as the primary units. Obviously these may be converted into SI units, but the CGS system is no longer used. [Some of the definitions of the fundamental units differ between these systems.]
si units are based on the metric system system international (French) international system (English)
SI means "International System [of Units]" (from the French abbreviation).
The US measurement system is based on the English system, or imperial units, though England has now long since converted to SI.
SI is also known as The International System of Units Please, do not mistake SI for the former, now obsolete, designation 'metric system'
SI Units
In the International System of Units (SI Units), time is measured in seconds.
In SI system, it is measured in Newton(N).
SI units are more accurate than English system units
The International System of Units, abbreviated "SI" from the French Le Système International d'Unités, is the modern form of the metric system.
International System of Units