Chapter 1Chapter 1Lesson 3Lesson 3

““Measurement”Measurement”

Key Concepts…Key Concepts…

What is scientific notation???What is scientific notation???

What units do scientists use for their What units do scientists use for their measurements???measurements???

What is the SI System and how do we What is the SI System and how do we use it???use it???

Activity (5-7 min)Activity (5-7 min)

1.1. Use a pen/pencil and measure the Use a pen/pencil and measure the length of the table you are sitting at. length of the table you are sitting at.

2.2. Record your measurementRecord your measurement

3.3. Repeat using a different pen/pencilRepeat using a different pen/pencil

4.4. Record your measurementRecord your measurement

Think…Why are your measurements Think…Why are your measurements different from each other???different from each other???

I. Using Scientific NotationI. Using Scientific Notation

A. A way of expressing a number as a A. A way of expressing a number as a value and a power of 10.value and a power of 10.

1. Why use it???1. Why use it???

-easy to use large/small numbers-easy to use large/small numbers

2. Ex. 400,000,000 2. Ex. 400,000,000

3. Ex. 35,300 3. Ex. 35,300

4. Ex. 0.0000456 4. Ex. 0.0000456 5. Ex. 4.58 x 105. Ex. 4.58 x 10-3-3

4.0 x 108

3.53 x 104

4.56 x 10-5

0.00458

II. Standards of MeasurementsII. Standards of Measurements

A. Standard – an exact quantity that A. Standard – an exact quantity that people agree on.people agree on.

1. Ex: a1. Ex: a

= 12 = 12 inches inches

2. a mile = 5280 feet2. a mile = 5280 feet

III. Different SystemsIII. Different Systems

A. English System – feet, gallons, A. English System – feet, gallons, cups, inches…cups, inches…

1. U.S. only country to use it.1. U.S. only country to use it.

B. SI SystemB. SI System

1. 1960 by the French1. 1960 by the French

2. Used worldwide2. Used worldwide

3. Based on powers of 103. Based on powers of 10

Common Prefixes (pg. 17)Common Prefixes (pg. 17)GigaGiga 10 1099 1,000,000,0001,000,000,000Mega Mega 10 1066 1,000,0001,000,000Kilo Kilo 10 1033 1,000 1,000Hecto Hecto 10 1022 100100Deka Deka 10 1011 1010Base Base 10 1000 11Deci Deci 10 10-1-1 0.10.1Centi Centi 10 10-2-2 0.010.01Milli Milli 10 10-3-3 0.0010.001Micro Micro 10 10-6-6 0.0000010.000001NanoNano 10 10-9-9 0.0000000010.000000001

ExamplesExamples1. Convert 1.0 m to dm?1. Convert 1.0 m to dm?

10 decimeters10 decimeters2. A road is 1000 m in length. What is 2. A road is 1000 m in length. What is

this in km?this in km? 1 kilometer1 kilometer

3. A small new planet is found 3 light 3. A small new planet is found 3 light years away from Earth. If the years away from Earth. If the diameter of this planet is 23,500 diameter of this planet is 23,500 meters, how many kilometers is its meters, how many kilometers is its diameter?diameter?

23.5 kilometers23.5 kilometers

More Conversions…More Conversions…

1. 2.3 mm 1. 2.3 mm cm cm

2. 4.05 km 2. 4.05 km meters meters

3. 5.7 micrometer 3. 5.7 micrometer mm mm

4. 10.01 Mm 4. 10.01 Mm km km

5. 0.0003 hm 5. 0.0003 hm mm mm

6. 1,234,567 micrometers 6. 1,234,567 micrometers Mm Mm

7. 1.34 x 107. 1.34 x 1033 deciliters deciliters liters liters