UNIT # 1 Introduction Objectives Reading 1.1 Metric System 1.2 1.3 Scientific Notation 1.4 Dimensional Analysis 1.5 1.6 1.7 1.8 Problems 1 | 2 | 3

MEASUREMENT

1.6 - Significant Figures

1.6.2 - Five Rules for Determining the number of Significant Figures in a Measurement

 RULES (Significant figures are the figures in red) Rule 1. All nonzero integers are significant. eg - 456 cm 456 cm has 3 significant figures Rule 2. All zeros to the left of the first nonzero digit are not significant since they are used to locate the decimal point. eg - 0.00567 kg 0.00567 kg has 3 significant figures Rule 3. All zeros between nonzero digits are significant. eg 1 - 207.08 cm 207.08 cm has 5 significant figures eg 2 - 0.0401 L 0.0401 L has 3 significant figures Rule 4. All zeros at the end of a number that has a decimal point are significant. eg 1 - 34.070 mg 34.070 mg has 5 significant figures eg 2 - 0.0670 g 0.0670 g has 3 significant figures eg 3 - 400. mm 400. mm has 3 significant figures Rule 5. Zeros at the end of a whole number that has no decimal point is confusing since they may or may not be significant. eg - 300 L ??????? The measurement, "300 L", as written is confusing.

Section 2.5
Significant Digits ..p21

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