3 - 1.3 Measurements Measurement: quantifying a substance...

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1.3 Measurements Measurement: quantifying a substance on some dimension Precision: reproducible results small variability in each measurement low random error Accuracy: measurements close to actual value the average of measurements is close to the true value low systemic error
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1.3 Measurements Precision describes random error, which is also termed uncertainty Uncertainty in measurements is unavoidable, in science it is important to describe the extent of uncertainty Significant figures is a system used to describe the uncertainty in a measurement
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1.3 Rules of Sig Figs Every digit that is non-zero is significant Zeros between non-zero digits are significant 25 0 8 Leading zeros are not significant 0.00 574 Trailing zeros are not significant unless there is a decimal 28 00 3.24 00 28 00.
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1.3 Sig Figs Number of sig figs in? 208 310 155.03 2.0 1800 6.0500
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1.3 Uncertainty Every measurement has uncertainty Uncertainty is communicated by significant
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This note was uploaded on 01/19/2012 for the course CHEM 1211 taught by Professor Hair during the Spring '08 term at Kennesaw.

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3 - 1.3 Measurements Measurement: quantifying a substance...

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