Question

Whar is a metric base unit?

Answer 1

http://chemistry.about.com/od/chemistry101/a/metricbases.htm
The metric system is a system of units of measurement established from its beginnings in 1874 by diplomatic treaty to the more modern General Conference on Weights and Measures - CGPM (Conferérence Générale des Poids et Measures). The modern system is actually called the International System of Units or SI. SI is abbreviated from the French Le Système International d'Unités and grew from the original metric system. Today, most people use the name metric and SI interchangeably with SI being the more correct title.

Answer 2

SI or metric is considered the main system of measurement units used in science today. Each unit is considered to be dimensionally independent from each other. These dimensions are described as the measurements of length, mass, time, electric current, temperature, amount of a substance, and luminous intensity.
The seven base units are:
- Length - Meter ( m )
- Mass - Kilogram ( kg )
- Time - Second ( s )
- Electric Current - Ampere ( A )
- Temperature - Kelvin ( K )
- Amount of a Substance - Mole ( mol )
- Luminous Intensity - candela ( cd )