The International System of Units (SI) defines seven SI base units[1] for a set of physical quantities of measure, or dimensions, that are used to define all other SI units, known as SI derived units.
The set of SI basic units consists of the metre, kilogram, second, ampere, kelvin, mole, and candela, which are the units for length, mass, time, electrical current, temperature, quantity of substance, and luminous intensity, respectively.
The SI base quantities of measure form a set of linearly independent dimensions as required by dimensional analysis commonly employed in science and technology. However, in a given realization of these units they may well be interdependent, i.e., defined in terms of each other.[1]
The names of all SI units are written in lowercase characters (e.g., meter, symbol m), while the symbols of units named after people are written with an initial capital letter (e.g., ampere, symbol A).
Many other non-SI units, such as the litre, are not SI units but are non-SI units accepted for use with SI.
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