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Unformatted text preview: Precision and Accuracy When we make a measurement in the laboratory we need to know how good it is. To this end, we introduce two concepts: Precision and Accuracy . Precision indicates degree of reproducibility of a measured number, and Accuracy indicates how close your measurements are to the true value. Let's look at throwing darts and trying to hit the bullseye as an illustration of these two concepts. When you make measurements in science you want them to be both precise and accurate. Two students, Raffaella and Barbara, measured the temperature of boiling water, which by definition should be 100C under 1 atmosphere of pressure. Each student made 10 temperature measurements, shown below as red (Raffaella) and blue (Barbara) dots. The average of Raffaella's temperature measurements is 100.1C and the average of Barbara's is also 100.1C. So, the accuracy of their measurements is identical. On the other hand, you can see from the figure that the So, the accuracy of their measurements is identical....
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This note was uploaded on 10/13/2011 for the course CHEMISTRY 121 taught by Professor Staff during the Fall '10 term at Bangladesh University of Eng and Tech.
- Fall '10