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21_pdfsam_2

# 21_pdfsam_2 - Quantity 4782 600 6.0 102 6.00 102 31.72...

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Quantity Signficant Digits 4782 4 600 1, 2, or 3 6 . 0 × 10 2 2 6 . 00 × 10 2 3 31.72 4 30.02 4 46.0 3 0.02 1 0.020 2 600.00 5 Table 2.1: Significant digits Examples: (2 . 43)(17 . 675) = 42 . 95025 = 43 . 0 (2.279h)(60 min/h) = 148.74 min = 148.7 min The conversion factor is exact (a definition). (4 . 00 × 10 2 kg)(2 . 2046lbm / kg) = 881 . 84lbm = 882 . lbm The conversion factor is not exact, but it should not dictate the precision of the result if this can be avoided. A conversion factor should be used that has one or two more significant figures than will be reported in the result. 589 . 62 / 1 . 246 = 473 . 21027 = 473 . 2 Addition and subtraction: The result should show significant digits only as far to the right as is seen in the least precise number in the calculation. Examples: 1725 . 463 + 189 . 2 + 16 . 73 = 1931
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