Chapter 1 Measurements - California State University ...
Chapter 1 Chemical Foundations
1.5 Significant Figures and
Calculations
Copyright ? 2005 by Pearson Education, Inc. Publishing as Benjamin Cummings
1
Significant Figures in Measured Numbers
Significant figures
? obtained from a measurement include all
of the known digits plus the estimated digit.
? reported in a measurement depend on the
measuring tool.
2
Significant Figures
3
Counting Significant Figures
All non-zero numbers in a measured number are significant.
Measurement 38.15 cm 5.6 ft 65.6 lb 122.55 m
Number of Significant Figures
4 2 3 5
4
Sandwiched Zeros
Sandwiched zeros
? occur between nonzero numbers. ? are significant.
Measurement 50.8 mm 2001 min 0.0702 lb 0.40505 m
Number of Significant Figures
3 4 3 5
5
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