reportingnumbers - CHE 197 Presentation Proper Presentation...

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1 CHE 197 Presentation Proper Presentation of Numerical Values in Scientific and Engineering Reports Jeffrey J. Weimer September 20, 2004 Reporting Numerical Values 2 Outline Foundations – What should be reported? – How should tables be presented? – How should graphs appear? Examples – Units: The “Smart” Way to Solve an Equation – Significant Digits: Abuse to the N th Degree – Tables: Not Just Placeholders for Numbers – Graphs: The Good, The Bad, and The Ugly
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2 Reporting Numerical Values 3 Foundations What should be reported? When you report a number as a result, you should report – The Numerical Value – The Units of the Numerical Value – Your Confidence in the Numerical Value Reporting Numerical Values 4 Foundations What should be reported? The Numerical Value This is the actual number that was calculated or measured. It may include a negative sign. It could also be expressed in scientific notation. Examples 12.345 -907 2.14 x 10 -15
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Reporting Numerical Values 5 Foundations What should be reported? The Units of the Numerical Value Most numerical values that are reported in science or engineering are associated with units. They can be in different systems and different formats. Examples 12.345 ft -907 J/mol 2.14 x 10 -15 kg/m 3 Reporting Numerical Values 6 Foundations What should be reported? The Units of the Numerical Value Unit Systems l t m American Engineering (AE) ft s lb m International System (SI) m s ? Examples
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reportingnumbers - CHE 197 Presentation Proper Presentation...

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