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Unformatted text preview: Rules for Counting Significant Figures in Measured Numbers Significant Figures- digits that result from a measurement such that only the digit farthest to the right is uncertain. The digit farthest to the right has some error in its value but is still significant. NOTE: The greater the number of significant figures in a measured number, the more reliable (accurate) the data. 1. All nonzero digits are significant. Ex. # # Sig. Figs. 24.5 3 311.2 4 27 2 2. Captive zeros - Zeros between nonzero digits are significant. Ex. # # Sig. Figs. 24.505 5 1.003 4 6.023 4 3. Trailing zeros - Zeros to the right of nonzero digits and to the right of the decimal place are significant if written. Ex. # # Sig. Figs. 1.30 3 1.300 4 1.3 2 0.500 3 20.00 4 4. Leading zeros - Zeros to the left of the first nonzero digit are NOT significant. (They just show the position of the decimal place.) Ex. # # Sig. Figs. 0.003 1 0.0102 3 0.00050 2 If you are unsure as to whether the zeros are significant or not, write the number in standard...
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This note was uploaded on 04/26/2008 for the course CHEM 116 taught by Professor Chigwada during the Summer '07 term at WVU.
- Summer '07