PPT-Metric Systems and Significant Figures

Mrs Charniauskaya Metric System Scientists all over the world use the same system of units so they can communicate information clearly This system is called Système Internationale dUnités. What are Significant Figures?. They are all the numbers in a measurement that are known with . certainty. plus the first digit that is uncertain.. Why use Significant Figures?. Significant figures are needed in science, because the tools we use to measure are not infinitely accurate. 2.3. A. What are Significant Figures?. The number of all certain digits in a measurement plus one estimated digit.. Example. 2.0 cm. 1. 0. 2. 3. 4. cm. 2 Significant figures. Examples. 1. 0. 2. 3. 4. &. 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. Golibjon. Berdiyorov. 2. Golibjon. Berdiyorov. , Room 148 Physics Building. Phone: . 860-3869/2283. e-mail: . golib@kfupm.edu.sa. www.cmt.ua.ac.be/golib/PHYS101. Syllabus and teaching strategy. 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.. Chapter 4. MAT 119. Objectives. Recall from memory the metric and household approximate equivalents.. Convert among units of measurement within the same system.. Convert units of measurement from one system to another.. References :. Basic Principles and Calculations in Chemical. Engineering, 7 edition,. . . David. M. . Himmerblau. and James B. Riggs.. ปริมาณสัมพันธ์สำหรับงานอุตสาหกรรม เล่ม . Measurements and Their Uncertainty. 3.1. 3.1. Measurements are fundamental to the experimental sciences. For that reason, it is important to be able to make measurements, and to use them correctly when calculating answers.. When taking scientific measurements, the goals are to measure . accurately. and with . precision. .. Accuracy. . refers to how close a measured value is to the actual or real . value. Precision. . SC3. Obtain, evaluate, and communicate information about how the Law of Conservation of Matter is used to determine chemical composition in compounds and chemical reactions. . d. Use mathematics and computational thinking … using significant figures.. Cartoon courtesy of . Lab-initio.com. Uncertainty in Measurement. . A digit that must be . estimated. . is called . uncertain. . A. . measurement. . always has some degree of uncertainty.. Why Is there Uncertainty?. Pacific/Atlantic Method636/584-6688GeneraltutoringeastcentraleduClick to advance slidesIn wordsRule 1 All non-zero digits are significantRule 2 Zeros in front of a number are notsignificantRule 3 Z The basic unit of length in the metric system All units of length in the metric system are derivedone hundredth1 centimeter1 one-hundredth of a meter10001 kilometer km1000 meters mhecto-1001 hectomete Homework for Chapter 1. Read Chapter 1. HW 1: pp. 26-31: 2,3,8,16,18,19, 28,29,38,39,52,54,56, 62, 68, 73, 74, 75.. Warmup. Perhaps the most recognizable equation in physics comes form Einstein’s theory of relativity: .