The International System (SI):

The International System is frequently abbreviated SI, that stands for Système International in French. This scheme in its previous form, mks, has existed since the year 1800s, though more newly it has been defined in a exact fashion by the General Conference on Weights and Measures.

The base units in SI quantify time, displacement, mass, temperature, brightness of light, electric current, and amount of matter (in conditions of the number of atoms or molecules in a sample). Correspondingly, the units in SI are termed as the second, the meter, the kilogram, the Kelvin (or degree Kelvin), candela, the ampere, and the mole.