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???

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???

I. Using Scientific Notation A. A way of expressing a number as a value and a power of 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  5. Ex x  4.0 x x x

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

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

Common Prefixes (pg. 17) Giga  ,000,000,000 Mega  ,000,000 Kilo  ,000 Hecto  Deka  Base  Deci  Centi  Milli  Micro  Nano 

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

More Conversions… mm  cm km  meters micrometer  mm Mm  km hm  mm 6. 1,234,567 micrometers  Mm x 10 3 deciliters  liters