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SI Units & Metric System

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Alison Fertig

on 11 August 2010

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Transcript of SI Units & Metric System

SI Units and the
Metric System Why SI System? 7 Fundamental properties
of Physics - 7 base units 1954 - decided on six base units for length, mass, time, temperature, electric current, and luminous intensity
1960 - added quantity as a base unit Standardized measurements for
science and commerce Adopted globally with a few
exceptions US, Burma & Liberia Uses metric prefixes -
powers of 10 Metric System Adopted in France in 1791 1875 - Metre Convention -
wanted uniformity for metrology After WWII, still many
countries with customary
systems or metric variations Base Units vs. Derived Units Base units represent different physical properties
All other units can be derived from base units
Example: Volume = length x length x length or m^3
Example: Electric charge (coulomb) 1 C = 1 A*s Metric Prefixes to Know...
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