Lecture4 - Chem 1P Lecture 4 Accuracy Dimensional analysis...

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Chem 1P Lecture 4: Accuracy & Dimensional analysis
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Significance in measurements Chang Section 1.8 basket basket basket basket basket basket basket basket board pole ring board fly out board ring basket via board Clearly, there is a difference in accuracy here
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Significance in measurements Chang Section 1.8 Precision and accuracy high precision high accuracy high precision low accuracy low precision low accuracy
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Significance in measurements Chang Section 1.8 How accurate is a measurement? Reading gives: 53.4 subject to error Most measurements carry an intrinsic error, typically in the last digits. This has consequences for susequent calculations using these measured values.
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numbers that matter 1. Nonzero integers count as significant figures 2. Zeros: a. Leading zeros (0.002) do not count as significant figures. b. Captive zeros (202.304) count as significant figures. c. Trailing zeros (1.00) count as significant figures after decimal point. 3. Exact numbers (3/4, π ) have infinite amount of significant figures. Chang Section 1.8
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Lecture4 - Chem 1P Lecture 4 Accuracy Dimensional analysis...

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