2Numbers notes b - Lecture 2 Quantitative Measure of...

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1 1 1 Lecture 2 square4 Quantitative Measure of Matter (Chapter 2) square4 Precision and Accuracy square4 Errors square4 Significant Firgures square4 Units and Calculations (Chapter 3) 2 Quantitative Measure of Matter (chapter 2) square4 Numbers: Exact Numbers -counted or defined -no uncertainty Measured Numbers -obtained with the use of some measuring device -always have some uncertainty 3 Measured Numbers 1 2 3 4 5 6 7 8 9 4 Measured Numbers square4 Precision -how close multiple measurements are to each other -directly related to the measuring device square4 Accuracy -how close a measurement is to the “true” or accepted value
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2 2 5 Errors square4 Random Errors -due to uncontrolled variables -result in a decrease in precision square4 Systematic Errors -constant errors -lead to a decrease in accuracy, do not affect precision -can be accounted for by calibration Any measurement has some uncertainty 6 Precision and Significant Figures square4 significant figures: -all digits that are known with certainty plus one digit that is unknown (uncertain) square4 precision in a measurement is indicated by the number of significant figures 2.64 is more precise than 2.6 7 Measured Numbers 1 2 3 4 5 6 7 8 9 8 square4
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