2. A Standard Measurement System Unit 1.4: The Metric System

3. When and why was the metric system invented? The metric system was invented in 1790 by a group of French scientists The metric system was invented because countries were using many different systems of measurement causing confusion and lack of consistency

4. Metric System A system of measurement used by the majority of countries on Earth based on the number 10

5. A Standard Measurement System The International System of Units (SI)

6. Scientists all over the world use the International System of Units to measure: Length Volume Mass Density Temperature Time

7. Figure 1: Calculating - How much larger is a kilo- than a deka-? 100 times

8. Notes Checkpoint: SI units are based on multiples of what number? SI units are based on multiples of 10 Add a zero Subtract a zero

9. Key Concept: Why do scientists use a standard measurement system? Using SI as the standard system of measurement allows scientists to compare data and communicate with each other about their results Using SI measurement also allows experiments to be repeated and most importantly achieve a desired result

10. Length Length is the distance from one point to another The basic unit of length in the SI system is the … The basic unit of length in the SI system is the meter

11. The two units that measure the length of smaller objects are, … millimeter centimeter

12. Complete the Table Below PrefixMeaningUnit of Length milli one-hundredth meter one-thousand

13. Complete the Table Below PrefixMeaningUnit of Length milliOne-thousandth one-hundredth meter one-thousand

14. Complete the Table Below PrefixMeaningUnit of Length milliOne-thousandthmillimeter one-hundredth meter one-thousand

15. Complete the Table Below PrefixMeaningUnit of Length milliOne-thousandthmillimeter centione-hundredth meter one-thousand

16. Complete the Table Below PrefixMeaningUnit of Length milliOne-thousandthmillimeter centione-hundredthcentimeter meter one-thousand

17. Complete the Table Below PrefixMeaningUnit of Length milliOne-thousandthmillimeter centione-hundredthcentimeter nonemeter one-thousand

18. Complete the Table Below PrefixMeaningUnit of Length milliOne-thousandthmillimeter centione-hundredthcentimeter noneonemeter one-thousand

19. Complete the Table Below PrefixMeaningUnit of Length milliOne-thousandthmillimeter centione-hundredthcentimeter noneonemeter kiloone-thousand

20. Complete the Table Below PrefixMeaningUnit of Length milliOne-thousandthmillimeter centione-hundredthcentimeter noneonemeter kiloone-thousandkilometer

21. Length Measuring Length

22. The longer lines on the metric ruler are called… centimeters The shorter lines on the metric ruler are called… millimeters

23. Notes Checkpoint: One centimeter is divided into how many millimeters? 10 millimeters (mm)

24. Figure 2: Calculating: Measure the turtle in figure 2 from the rear of its shell to the front. Record its length in both centimeters and millimeters. 8.8 cm 88 mm

25. Measurement-A Common Language Mass (Weight)

26. The basic unit of mass in the SI system is the… The basic unit of mass in the SI system is the kilogram.

27. What are three objects whose masses would be measured in kilograms. Car Teacher’s Desk Desk Top Computer

28. A smaller object’s mass such as a paper clip would be measured in Smaller objects such as a paper clip would be measured in milligrams.

29. Conversions 1 kg=g 1 g=mg

30. Conversions 1 kg=1,000g 1 g=mg

31. Conversions 1 kg=1,000g 1 g=1,000mg

32. Measurement-A Common Language Volume

33. When measuring the volume of a liquid, scientists use a unit known as the… Liter (L). 2 L bottle

34. To measure the volume of smaller liquids, the _________ is used. Milliliter (mL) Graduated Cylinder

35. This instrument has markings that are in increments of… 1 milliliter (mL)

36. Meniscus The curve in the top surface of water in the graduated cylinder

37. Figure 4: Observing - What is the proper way to read a meniscus? Read the milliliter marking at the bottom of the curve

38. Common Conversions For Volume 1 L= =1,000 cm³ 1 mL=

39. Common Conversions For Volume 1 L=1,000 mL =1,000 cm³ 1 mL=

40. Common Conversions For Volume 1 L=1,000 mL 1 L=1,000 cm³ 1 mL=

41. Common Conversions For Volume 1 L=1,000 mL 1 L=1,000 cm³ 1 mL=1 cm³

42. Using the Metric Staircase method for conversions. Go Smaller Go Larger Let’s Try One: 4030 mm = ? m Climb 3 steps so move the decimal 3 places to the left, so: 4.03 m