201measurements

# 201measurements - MEASUREMENTS Glenn V Lo Department of...

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MEASUREMENTS Glenn V. Lo Department of Physical Sciences Nicholls State University

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MEASUREMENT assigning a value to an observation For science and trade: value assigned should  be  in reference to  or  traceable to  a “standard” Reported measurement generally has 2 parts: Number  (indicates the value) Unit  (indicates the standard) Ex:  5.0   kg  (means 5.0 times the mass of a cylinder stored in a vault at the  International Bureau of Weights and Measures in France; by  agreement the cylinder is defined to have a mass of 1 kg)
THE STANDARDS US Trade National Institute of Standards and Technology  (Gaithersburg, Maryland)  http://www.nist.gov English  System of Units  International/Scientific International Bureau of Weights and Measures  (BIPM)  http://www.bipm.fr/enus/welcome.html Systeme Internationale ( SI ) Units Evolved from  metric  system

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The SI Units Base units  for seven  fundamental  quantities  were officially adopted in 1960 What are they? mass, length, time, temperature, etc. http://www.bipm.fr/enus/3_SI/base_units.html All other quantities can be  derived  from  measurements of fundamental quantities. Example: speed = length divided by time Units for derived quantities are combinations of  base units (speed: m/s).  Some are given special  names (ex. Joule, J = kg m / s 2 http://www.bipm.fr/enus/3_SI/si-derived.html
Units of Mass SI Base unit for Mass:

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## This note was uploaded on 06/11/2009 for the course CHEM 105 taught by Professor Wessel during the Spring '08 term at Nicholls State.

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201measurements - MEASUREMENTS Glenn V Lo Department of...

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