PPT-Significant (Measured) Digits

Measuring with Precision Defn Those numbers that result from directly measuring an object It shows the precision of the measurement Units must be included no units no sd The precision of the measurement depends upon the measuring instrument. Measurements are always approximate. They depend on the precision of the measuring instrument – that is the amount of information that the instrument can provide.. Look at the graduations on a beaker versus the graduations on a graduated cylinder. Which instrument will provide better information?. Learning Goals …. … convert numbers to scientific notation. … convert measurements using the metric system. … identify the number of significant digits in a . measurement . Scientific Notation. Physical Science. What is a significant figure?. There are 2 kinds of numbers:. Exact: the amount of money in your account. Known with certainty.. What is a significant figure?. Approximate: weight, height—anything MEASURED. No measurement is perfect.. Objectives:. State the purpose of significant digits. State and apply the rules for counting and doing calculations with significant digits. One way engineers use significant digits….. What's so significant about significant digits?. &. Scientific Notation. Significant Figures. Scientist use significant figures to determine how precise a measurement is. Significant digits in a measurement include all of the known digits plus one estimated digit. Using Significant Figures. S8CS3: . Students will have the computation and estimation skills necessary for analyzing data and following scientific explanations.. S8CS3d:.  Decide what degree of precision is adequate, and round off appropriately.. RULES FOR SIGNIFICANT DIGITS. 1. Non-zero digits are ALWAYS significant.. . Example-. 123456789. 2. Zeros that are between other significant digits are ALWAYS significant.. . Example. - 3004 . 3. Final zeros that occur before or after the decimal are ALWAYS significant.. 5700. 1. 2. 3. 4. Multiply. 843.5 * 21103. 17800380.5. 1.780 x 10. 8. 1.780 x 10. 7. 17800000. Which of the following instruments would give you the most accurate measurement?. Round to 3 significant digits.. errors. Numerical math != Math. . (cont.) . . Loss of significance. In Previous Lectures. :. Absolute and relative errors.. You. . considered and ran the code . numderivative.cc. ; . observed two types of errors – . Introduction to Engineering Design. The U S Customary . System. System of measurement used in the United States . Similar to the British Imperial System of Measurement, but not identical. Common U S Customary. 1 All non-zero digits are always significant154 3 sig figs 2 Interior zeros zeros between nonzero numbers are3 Leading zeros zeros at the beginning of a number are NOT 0103 3 sig figs 0000002 1 Diploma ExaminationsSignificant Digits measured values1For all non-logarithmic values regardless of decimal position any of the digits 1 to 9 is a significant digit 0 may be significant For example 12 In physics we will be taking measurements and using a lot of numbers for calculations. However, we have to be aware of significant figures (sig figs) because every measurement has a certain degree of . Length is measured by observing the marked lines at . the end . of a ruler. The last digit in your measurement is an . estimate, obtained by . visually dividing the space between the marked lines.. Learning Goal .