202sigfigs

# 202sigfigs - SIGNIFICANT FIGURES Glenn V Lo Department of...

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SIGNIFICANT FIGURES Glenn V. Lo Department of Physical Sciences Nicholls State University

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Reporting Measurements Properly reported  measurements should  give reader an indication of its  precision   (reproducibility).  Precision is indicated explicitly by quoting the  uncertainty.  Example: 25.2  +  1.6  mm Precision is implied by the way the reported  value is rounded off. Example: 25.00 mL is  taken as more precise than 25.0 mL
Interpreting Uncertainties What does something like                          48.06 +  0.18 mL    mean? 48.06 – 0.18 = 47.88 48.06 + 0.18 = 48.24 IF we were the repeat the measurement lots  of times, we would get an average value of  48.06 and most of the values we get would  fall between 47.88 and 48.24 mL.

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Quoting Uncertainties In general use only one or two  nonzero  digits  for the  uncertainty. Round off the  value  to as many decimal  places as the uncertainty. Example 8.6214   +  0.0 223 , should be reported as 8.621   +  0.0 22 , or 8.62   +  0.0 2
Determining Uncertainties Do  replicate  runs, examine values. Example:

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202sigfigs - SIGNIFICANT FIGURES Glenn V Lo Department of...

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