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154 The Sourcebook for Teaching Science ACTIVITY 8.1.2 Advance Organizers in 8.2 Orders of Magnitude: Your Science Text Textbook authors and publishers use “ traffi c The Universe in signs ” to inform readers about the structure and Powers of Ten content of the book. Research has shown that these advance organizers help students learn and “ How wide is the Milky Way galaxy? ” “ How small remember new material by developing structures is a carbon atom? ” These questions may sound or schemas into which new information can be simple, but their answers are virtually impos- placed. Sadly, many students ignore these signs and sible to comprehend since nothing in our realm spend much more time reading than necessary, yet of experience approximates either of these meas- with minimal understanding and retention. ures. To grasp the magnitude of such dimensions Before reading a textbook, you should study is perhaps impossible, but it is relatively easy to its structure and features. Complete the following express such dimensions by scaling up or down activity for a chapter that your science instructor (expressing them in orders of magnitude greater assigns. By understanding the structure of the text, or smaller) from things with whose dimensions we you will understand the structure of the discipline are familiar. An order of magnitude is the number and be better able to integrate new ideas into your of powers of 10 contained in the number and gives existing mental outline. a shorthand way to describe scale. An understand- ing of scale allows us to organize our thinking and Organization of the Book experience in terms of size and gives us a sense of Special features: What are the unique or special dimension within the universe. features of this book? Most authors write a preface to explain their purpose in writing and ACTIVITY 8.2.1 Understanding Powers describe the special features of their work. of Ten Themes: What are the major themes of your text- Note: This is an Internet - based activity. book? Most authors group chapters in units To simplify the expression of very large and with names that refl ect the major themes of small numbers, scientists often use scientifi c nota- the book. tion. Scientifi c notation involves writing a number Topics: What are the main topics of the unit you as the product of two numbers. The fi rst one, the are studying? This can generally be deduced digit value, is always more than 1 and less than 10. from the chapter titles. The other, the exponential term, is expressed as a power of 10. Table 8.3 compares decimal and sci- Organization of the Chapter entifi c notation. Objectives: What are the goals or objectives of the The diameter of the Milky Way Galaxy is chapter you are studying? These are frequently believed to be about 1,000,000,000,000,000,000,000 listed at the beginning of the chapter. meters. By contrast, the diameter of the nucleus Subtopics: What are the subtopics of the chap- of a carbon atom is only approximately 0.000 ter? The subtopics are the division headings 000 000 000 01 meters. In scientifi c notation, the within chapters, often shown in BOLDFACE diameter of the Milky Way is 1 ϫ 10 21 m, and CAPITALS . the diameter of the carbon nucleus is 1 ϫ 10 Ϫ 14 Major points: What are the major points of the m. The Milky Way is therefore approximately section you are now studying? The major 10 35 times (35 orders of magnitude) larger than points are generally shown in lowercase bold the carbon atom. Calculators and computers may letters . express the dimensions of the Milky Way and Key terms: What are the key terms of the section the carbon nucleus as 1.0E21 and 1.0E- 14, where you are now studying? In most textbooks, the E stands for the exponential term. The speed of key terms are shown in italics or bold letters. light, approximately 300 million (299,792,458) m cc08.indd08.indd 154154 55/9/08/9/08 55:57:33:57:33 PPMM Organizing Science Information and Concepts 155 Table 8.3 Decimal and Scientifi c Notation Decimal Scientifi c Order of Decimal Scientifi c Order of Notation Notation Magnitude Notation Notation Magnitude .001 1 ϫ 10 Ϫ 3 Ϫ 3 10 1 ϫ 101 1 .01 1 ϫ 10 Ϫ 2 Ϫ 2 100 1 ϫ 10 2 2 .1 1 ϫ 10 Ϫ 1 Ϫ 1 1,000 1 ϫ 103 3 1 1 ϫ 10 0 0 10,000 1 ϫ 10 4 4 per second, is expressed in scientifi c notation as 8 Ϫ3Њ Ϫ2Њ Ϫ1Њ approximately 3.0 ϫ 10 m/s (3.0E8). Avogadro ’ s 10 m 10 m Dimension (m) 10 m number, the number of molecules in a mole (602 –3 –2 213670000000000000000), is expressed as 6.02 ϫ 10 23 (6.02E23). Scientifi c notation is particularly helpful when trying to express the scale of the universe. In 1957, Dutch educator Kees Boeke published Order of Magnitude Cosmic View: The Universe in 40 Jumps, in which –1 he helped readers visualize the size of things in the known universe with reference to a square meter (10 0 m 2 = 1 m 2 ). 2 In this book, Boeke showed successively smaller pictures, each one a tenth the dimension of the previous (10 Ϫ 1 m, 10 Ϫ 2 m, 10 Ϫ 3 m, and so on) as well as successively larger pictures, each ten times larger than the previous (101 m, 10 2 Figure 8.2 Orders of Magnitude Ϫ 3, Ϫ 2, Ϫ 1 m, 10 3 m, and so on). A number of moviemakers3 and Web developers have followed Boeke ’ s idea in an effort to help people understand the scale of things in the universe. After examining “ powers of area three orders of magnitude greater than the ten ” resources online (look on sciencesourcebook. square millimeter represented by the tiny black com or www.powersof10.com , or search “ powers of box. Measuring with a meter stick, place mark- ten ” ), perform the following investigation. ers at the four corners of a 10 m square in one Figure 8.2 displays millimeter graph paper. corner of your school ’ s football field. This is The tiny black square in the upper left corner four orders of magnitude greater than the origi- is 1 mm on a side, (10 Ϫ 3 meters). The sides of nal black square (1 ϫ 10 4 times larger). If space the gray square in the upper left corner are an permits, mark out a 100 m square as shown in order of magnitude greater than the black square Figure 8.3 . This square has sides that are five (10 mm per side, 10 Ϫ 2 m). Finally, the sides of orders of magnitude larger (1 ϫ 10 5 ) than the the entire sheet, with 100 mm per side (10 Ϫ 1 m), original black square. are two orders of magnitude greater than the black You may continue to increase the order of square and one order of magnitude greater than magnitude by using satellite photos of your cam- the gray square. pus that are available on the Internet (look on Working with your classmates, create a sciencesourcebook.com , satellite view at maps. square meter (1000 mm on a side) by tap- google.com , or earth.google.com ). By zooming ing 100 of these squares together in a 10 ϫ 10 out of the satellite photo such that the football square. This is 1 square meter with sides and fi eld represents approximately only one - tenth of cc08.indd08.indd 155155 55/9/08/9/08 55:57:33:57:33 PPMM 156 The Sourcebook for Teaching Science Dimension (m) Table 8.4 Orders of Magnitude in Length: Common Items 100Њm 101Њm 102m Item Length (m) Item Length (m) 0 1 Ϫ 3 1 160 feet 1 ϫ 10 1 ϫ 10 ϫ Ϫ 2 1 ϫ 10 2 1 10 Ϫ 1 3 1 ϫ 10 1 ϫ 10 48.8m 0 4 Rose Bowl 1 ϫ 10 1 ϫ 10 2 Each student in the class will be assigned one or 100 yd 91.4m more of the items in Table 8.5 . In the upper left cor- ner of a standard 8.5 " ϫ 11 " sheet of paper, write in small (black) square 10m2 large or bold characters the approximate dimension medium (gray) square 10m2 of your object in scientifi c notation. For example, if large (white) square 100 m2 you are assigned the Earth, you will write “ 10 8 m ” Order of Magnitude In the upper right corner, identify the object ( “ the Earth ” ). In the center of the sheet, place a picture of Figure 8.3 Orders of Magnitude 0, 1, 2 the object. Internet - based image search engines (see the fi eld of view (Figure 8.4 ), you have reached the sciencesourcebook.com or google.com ) may be useful sixth order of magnitude. in acquiring pictures that can be copied or drawn. Some mapping programs may allow you Below the image, give a brief description of the object. to zoom out to the diameter of the Earth, As a class, arrange the photographs around the room approximately 1.3 ϫ 10 10 mm, or ten orders of from smallest to largest, as shown in Figure 8.5 . magnitude greater than the 1 m square you started Ϫ 0 7 10 5m Red Blood Cell 10 m Doorknob height 10 m Equator to pole with.
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