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Unformatted text preview: • Often useful as a sanity check (for example, of an equation) • Treat dimensions (units) as algebraic quantities Dimensional analysis Estimates and OrderofMagnitude Calculations • OrderofMagnitude: Correct within a factor of ten • Eg: Estimate the annual gas consumption of cars in Canada Significant Figures • Significant figure is the number of reliably known digits. • Leading zeros are not significant. • Trailing zeros are ambiguous: The last digit of 1500 could be known exactly, or could be approximated. • Correct treatment: Use scientific notation. Significant Figures Multiplication • Multiplication and Division: Significant figures of the result should be adjusted to the significant figures of the factor with the lowest number of significant figures. Significant Figures Addition • Addition and subtraction: Number of decimal places in the result should equal the smallest number of decimal places in any term....
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 Spring '09
 Ragan
 International System of Units, United States customary units, Conversion of units

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