SI Base Unit

SI Base Unit

The International System of Units (SI) defines seven units of measure as a basic set from which all other SI units are derived. These SI base units and their physical quantities are:

  • metre for length (US English: meter)
  • kilogram for mass (note: not the gram)
  • second for time
  • ampere for electric current
  • kelvin for temperature
  • candela for luminous intensity
  • mole for the amount of substance.

The SI base quantities form a set of mutually 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.

The names of SI units are written in lowercase characters (the 'degree Celsius' meets this rule, as 'degree' is the unit, and 'Celsius' is a modifier). The symbols of units are written in lowercase (e.g. metre has the symbol m), except that symbols for units named after persons are written with an initial capital letter (e.g., the hertz has the uppercase symbol Hz).

Many other units, such as the litre (US English: liter), are formally not part of the SI, but are accepted for use with SI.

Read more about SI Base Unit:  The Seven SI Base Units, Future Redefinitions

Other articles related to "base, bases, si base unit, base units, unit":

Bishkek - Transportation - Air
... use Manas International Airport as an air base for its military operations in Afghanistan and Iraq ... Russia subsequently (2003) established an air base of its own (Kant Air Base) near Kant some 20 kilometres (12 mi) east of Bishkek ...
... Antiprisms are similar to prisms except the bases are twisted relative to each other, and that the side faces are triangles, rather than quadrilaterals ... In the case of a regular n-sided base, one usually considers the case where its copy is twisted by an angle 180°/n ... is obtained by the line connecting the base centers being perpendicular to the base planes, making it a right antiprism ...
SI Base Unit - Future Redefinitions
... have been several modifications to the definitions of the base units, and additions of base units, since the Metre Convention in 1875 ... Since the redefinition of the metre in 1960, the kilogram is the only unit which is directly defined in terms of a physical artifact rather than a property of nature ... continue their efforts to refine experiments that link the unit of mass to fundamental or atomic constants with a view to a future redefinition of the kilogram." Two main possibilities have attracted ...
K. I. Sawyer Air Force Base
... Sawyer Air Force Base is a decommissioned U.S ... Air Force base in Marquette County, Michigan, southeast of the city of Marquette ... The base, near the center of Michigan's Upper Peninsula, operated for nearly forty years and closed in 1995 ...
K. I. Sawyer Air Force Base - History - Legacy
... Sawyer AFB was a favorite base among the SAC community ... Although isolated and definitely northern, it was an attractive base for its pleasing North Woods location and its proximity to outdoor activities off the base, including hunting, fishing ... While the base was sometimes referred to as "K.I ...

Famous quotes containing the words unit and/or base:

    During the Suffragette revolt of 1913 I ... [urged] that what was needed was not the vote, but a constitutional amendment enacting that all representative bodies shall consist of women and men in equal numbers, whether elected or nominated or coopted or registered or picked up in the street like a coroner’s jury. In the case of elected bodies the only way of effecting this is by the Coupled Vote. The representative unit must not be a man or a woman but a man and a woman.
    George Bernard Shaw (1856–1950)

    Things base and vile, holding no quantity,
    Love can transpose to form and dignity.
    Love looks not with the eyes, but with the mind,
    And therefore is winged Cupid painted blind.
    William Shakespeare (1564–1616)