1. 1 Using Numbers in Science AND Metric System

2. 2 Parts of a Measurement 1.The value (numerical portion) 2.The unit (describes what units) 3.The name of substance being measured EX: 1 teaspoon salt 2 liters of pop

3. 3 The Metric System & 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

4. 4 SI (International System) units Lengthmeterm Masskilogramkg TemperatureKelvinK TimesecondS VolumeLiterL Centigrade or Celsius = ⁰C This is the unit we will use in lab for temperatures!

5. Prefixes for Metric Units <1 deci (d) = 1/10 = 0.1 centi (c) = 1/100 = 0.01 milli (m) = 1/1000 = 0.001 decimilli (dm) 10 -4 centimilli (cm) 10 -5 micro ( µ) 10 -6 = 1/100000 = 0.000001 5

6. Prefixes for Metric Units >1 kilo (k) = 1000 hecto (h) = 100 deka (da) = 10 6

7. 7 kilohectodecaBase Unit decicentimillimicro khdagram (g)dcmmμ 100010010liter (L)0.10.010.0010.000001 10 3 10 2 10 1 meter (m)10 -1 10 -2 10 -3 10 -4 10 -5 10 -6 Metric Unit Conversions

8. Millimeter Could be the diameter of a straight pin

9. 9 Centimeter 1 inch = 2.54 centimeters Which is about the length of a sugar cube A paperclip could be about 2.54cm long

10. 10 Meter

11. Kilometer

12. Mass 12

13. Mass 13

14. Volume 14

15. Volume 15

16. Class Activity 1 – Understanding Metric Units Part A - Matching A.Length B.Mass C.Temperature D.Time E. Volume (liquids) Part B – select the best prefix

17. Class Activity – Part C What are the correct abbreviations? 17 ____ milligram____ milliliter____ liter_____centimeter ____ kilogram____ millimeter____ kilometer____ gram ____ meter____ millisecond____ microgram_____ hectometer ____ micrometer____ microliter

18. Part D 18

19. 19

20. 20

21. 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 21

22. 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 22

23. 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

24. What units would best be used to record the length, volume or mass of these objects?