1. Chapter 1 Lesson 3 “Measurement” Key Concepts… What is scientific notation??? What units do scientists use for their measurements??? What is the SI System and how do we use it???

2. Activity (5-7 min) 1.Use a pen/pencil and measure the length of the table you are sitting at. 2.Record your measurement 3.Repeat using a different pen/pencil 4.Record your measurement Think…Why are your measurements different from each other???

3. I. Using Scientific Notation A. A way of expressing a number as a value and a power of 10. 1. Why use it??? -easy to use large/small numbers -easy to use large/small numbers 2. Ex. 400,000,000  3. Ex. 35,300  4. Ex. 0.0000456  5. Ex. 4.58 x 10 -3  4.0 x 10 8 3.53 x 10 4 4.56 x 10 -5 0.00458

4. II. Standards of Measurements A. Standard – an exact quantity that people agree on. 1. Ex: a = 12 inches 2. a mile = 5280 feet 2. a mile = 5280 feet

5. III. Different Systems A. English System – feet, gallons, cups, inches… 1. U.S. only country to use it. B. SI System 1. 1960 by the French 2. Used worldwide 3. Based on powers of 10

6. Common Prefixes (pg. 17) Giga  10 9 1,000,000,000 Mega  10 6 1,000,000 Kilo  10 3 1,000 Hecto  10 2 100 Deka  10 1 10 Base  10 0 1 Deci  10 -1 0.1 Centi  10 -2 0.01 Milli  10 -3 0.001 Micro  10 -6 0.000001 Nano  10 -9 0.000000001

7. Examples 1. Convert 1.0 m to dm?  10 decimeters 2. A road is 1000 m in length. What is this in km?  1 kilometer 3. A small new planet is found 3 light years away from Earth. If the diameter of this planet is 23,500 meters, how many kilometers is its diameter?  23.5 kilometers

8. More Conversions… 1. 2.3 mm  cm 2. 4.05 km  meters 3. 5.7 micrometer  mm 4. 10.01 Mm  km 5. 0.0003 hm  mm 6. 1,234,567 micrometers  Mm 7. 1.34 x 10 3 deciliters  liters