CHE 106 Lecture Notes - Lecture 3: Significant Figures, Scientific Notation
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Precision: refers to the closeness that a set of values are away from each other. Accuracy: refers to the closeness that a set of values are away from the true value. Significant figures: indicate the precision of a measured number. Zero"s preceding first nonzero digit are not significant. Zero"s to the right of decimal after nonzero digits are significant. Give the same number of decimal places as the number with the smallest amount decimal places found the values used. Give as many significant figures as the number with the smallest amount of significant figures found in the values used. Look at the leftmost digit to be dropped. 1. 2151 rounded to 3 significant figures is 1. 22. Exact #: the number that arises when you count items or define a unit. Scientific notation: zero"s at end of nondecimal number may or may not be significant. Expresses a number between 1 and 10 with appropriate x10 a.
