1. OBJECTIVES:9/21/09 1. Describe the differences between the English and Metric System. 2. Explain why using one system world-wide would be useful. 3. Convert between English and metric units.

2. Why do we measure things? To compare things To determine exact amounts To collect data

3. What is the “English” System? What we commonly refer to as the “English” system: United States Customary System Many of the units have historical basis that goes back further than the Middle Ages! EX: 3 Barleycorns = 1 Inch (YES - the length of a corn of barley!!) Can you see potential problems?

5. Activity! You and your partner: Come up with a novel or unique way to measure the length of:  The lab table  Your chair leg  Your height Use the SAME unit of measurement for all of them!!! Report your data to Ms. Smyder

6. DISCUSSION What did you learn from this activity? What are the problems you encountered when trying to compare measurements? Mathematically, how easy or difficult would it be to convert between you and your classmates’ units?

9. The Metric System or SI First adopted in France in 1791. The system of measurement used by most of the world. International System of Units (Système International d'Unités ) also known as the SI system. System used by ALL SCIENTISTS!!

10. Why is the Metric System So Great? It is based on the number 10!!!!! 1 meter = 10 decimeters 1 decimeter = 10 centimeters 1 centimeter = 10 millimeters IT’S SO EASY!

11. VOCABULARY!

12. Standard An exact quantity that people agree to use for comparison.

13. SI System of measurement used world- wide in science.

14. Metric System The FIRST system of measurement that was based on units of ten.

15. Prefixes in the Metric System Used with the base unit to indicate (show) the multiple of ten that is being used with the base unit.

16. Base units The basic unit of a type of measurement Length – Meter Mass – Gram Volume - Liter

17. Length Distance between two points

18. Meter Metric base unit of length

19. Meterstick Tool used to measure length

20. Volume Amount of space occupied by an object

21. Liter Metric base unit used to measure volume.

22. Graduated Cylinder Tool used to measure volume of a liquid.

23. Mass Amount of matter that an object has.

24. Gram Metric base unit used to measure mass.

25. Balance Tool used to measure mass.

26. Density Mass per unit volume.

27. Time The interval between two events.

28. Second SI base unit of time.

29. Temperature A measurement of heat.

30. Thermometer Tool used to measure temperature.

31. Celcius Temperature scale used in most laboratories.

32. Kelvin Official SI unit of temperature.

33. PREFIX TABLE PREFIXMeans Multiplied… Kilo -1000x Hecto -100x Deka -10x BASE UNIT Deci -0.1x Centi -0.01x Milli -0.001x

34. Ladder Method How do you use the “ladder” method? 1 st – Determine your starting point. 2 nd – Count the “jumps” to your ending point. 3 rd – Move the decimal the same number of jumps in the same direction. 4 km = _________ m Starting Point Ending Point How many jumps does it take? 4. 1 __. 3 2 = 4000 m

35. Try these conversions using the ladder method. 1000 mg = ____1__ g 1 L = __1,000_ mL160 cm = _1,600__ mm 14 km = _14,000_ m109 g = _0,109__ kg 250 m = __0.25__ km Conversion Practice Compare using, or =. 56 cm 698 mg x10 x100  10  1000  100

36. Write the correct abbreviation for each metric unit. 1) Kilogram _kg__ 4) Milliliter __ml_ 7) Kilometer _km__ 2) Meter _m__ 5) Millimeter __mm_ 8) Centimeter __cm_ 3) Gram __g__ 6) Liter ___l__ 9) Milligram _mm__ Try these conversions, using the ladder method. 10) 2000 mg = ___2g__ g 15) 5 L = __5000_ mL 20) 16 cm = ___160_ mm 11) 104 km = __104,000_ m 16) 198 g = __0.198__ kg 21) 2500 m = __2.5__ km 12) 480 cm = __4.8_ m 17) 75 mL = __0.075_ L 22) 65 g = _65,000_ mg 13) 5.6 kg = _5600_ g 18) 50 cm = _0.5_ m 23) 6.3 cm = _63__ mm 14) 8 mm = _0.8__ cm 19) 5.6 m = _560__ cm 24) 120 mg = 0.120__ g Metric Conversion Challenge