1 Using Numbers in Science AND Metric System

2 Scientific Measurements Made in metric units Referred to as the International System or SI units Based on the decimal system Related by powers of 10 Each type has a base unit Use prefixes to refer to a unit larger or smaller than the base by some power of 10

3 SI (International System) units Lengthmeterm Masskilogramkg TemperatureKelvinK TimesecondS VolumeLiterL Centigrade or Celsius = ºC This is the unit we will use in lab for temperatures!

Prefixes for Metric Units <1 deci (d) = 1/10 = 0.1 centi (c) = 1/100 = 0.01 milli (m) = 1/1000 = decimilli (dm) centimilli (cm) micro ( µ) = 1/ =

Prefixes for Metric Units >1 deka (da) = 10 hecto (h) = 100 kilo (k) =

6 Kilometer

7 Meter

8 Centimeter

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13 kilohectodecaBase Unit decicentimillimicro khdagram (g)dcmmμ liter (L) meter (m) Metric Unit Conversions (blue chart)

14 Comparison Ideas equals

Class Activity What are the correct abbreviations? 15 ____ milligram____ milliliter____ liter_____centimeter ____ kilogram____ millimeter____ kilometer____ gram ____ meter____ millisecond____ microgram ____ micrometer____ microliter

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Review Questions 1. What does the prefix "milli" mean? A.millionth millionth B.thousandththousandth C.hundredthhundredth 2.A liter is a little more than a _______ A.pound pound B. gallon gallon C. quartquart 19

3. What is a good height for a basketball player? A. 6 meters6 meters B. 2 meters2 meters C. 6 millimeters6 millimeters 4. Which is the longer distance to run ? A. 50 meters 50 meters B. 50 kilometers 50 kilometers C. 50 miles50 miles 20

5. Which value would be right for the mass of a A. 17 mg B. 17 g C. 17 kg 6. Which value would be right for the mass of a A. 460 mg B. 460 g C. 460 kg