SI

+ SI prefixes yotta- 1 000 000 000 000 000 000 000 000  zetta- 1 000 000 000 000 000 000 000  exa-  1 000 000 000 000 000 000  peta-  1 000 000 000 000 000  tera-  1 000 000 000 000  giga-  1 000 000 000  mega-  1 000 000  kilo-  1 000  hecto-  100  deca-  10    1 deci-  1/10  centi-  1/ 100  milli-  1/ 1 000  micro-  1/ 1 000 000  nano-  1/ 1 000 000 000  pico-  1/ 1 000 000 000 000  femto-  1/ 1 000 000 000 000 000  atto-  1/ 1 000 000 000 000 000 000  zepto-  1/ 1 000 000 000 000 000 000 000  yocto-  1/ 1 000 000 000 000 000 000 000 000

The SI (French Système internationale d'unités, Internaitional Seestem o Units) is a seestem o meisurin based on the metre for lenth or displacement, kilogram for mass, an saicont for time.

The metre, kilogram an saicont can be uised ane wi anither, makkin units o meisurment for ither quantities, sic as vollum, energy, pressur, an velocity.

Whan talkin anent lairger or smaaer meisurments, mair syllables is uised; for exemplar, kilometre means 1000 meter, an milligram means 1/1000 o a gram. The prefixes is shawn in the table on the richt-haund side.

 History an uiss 
The SI units wis thocht oot in Fraunce efter the French Revolution.
Thay are nou uised aa ower the warld, but thay arna gey popular in some kintras, sic as the Unitit States.

Even the Unitit Kinrick, that creatit the auld US units o meisurment, is nou "metric", acause o staundardeisation athort the European Union.

 Base units o meisurment 
The SI base units is meisurments uised bi scientists an ither fowk aroond the warld. Aa the other units can be screived bi pittin thir seeven base units thegither in different weys. Thir units is cryed derivate units.

 metre (m), unit o lenth (whiles l, whiles s, whiles d)
 kilogram (kg), unit o mass (m)
 saicont (s), unit o time (t)
 ampere (A), unit o electric flow (I)
 kelvin (K), unit o temperatur (T)
 mole (mol), unit o amoont o substance (n)
 candela (cd), unit o luminous intensity (I)

 See an aa 
 British Weights and Measures Association

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Category:Physics