1. Copyright © 2015, 2010, and 2007 Pearson Education, Inc. 1 Chapter 8 Measurement

2. CHAPTER Copyright © 2015, 2010, and 2007 Pearson Education, Inc. 2 8 Measurement 8.1Linear Measures: American Units 8.2Linear Measures: The Metric System 8.3Converting Between American Units and Metric Units 8.4Weight and Mass; Medical Applications 8.5Capacity; Medical Applications 8.6Time and Temperature 8.7Converting Units of Area

3. OBJECTIVES Copyright © 2015, 2011, and 2008 Pearson Education, Inc. 3 8.4 Weight and Mass; Medical Applications aConvert from one American unit of weight to another. bConvert from one metric unit of mass to another. cMake conversions and solve applied problems concerning medical dosages.

4. Copyright © 2015, 2010, and 2007 Pearson Education, Inc. 4 American Units of Weight 1 lb = 16 ounces (oz) 1 ton (T) = 2000 pounds (lb)

5. 5 Copyright © 2015, 2010, and 2007 Pearson Education, Inc. Example How many ounces are in 3 pounds? Solution 3 lb = 3  1 lb = 3  16 oz Substituting 16 oz for 1 lb = 48 oz

6. 6 Copyright © 2015, 2010, and 2007 Pearson Education, Inc. Example Complete: 17,258 lb = ____ T. Solution

7. Copyright © 2015, 2010, and 2007 Pearson Education, Inc. 7 The basic unit of mass is the gram (g), which is the mass of 1 cubic centimeter (1 cm 3 ) of water.

8. Copyright © 2015, 2010, and 2007 Pearson Education, Inc. 8 Metric Units of Mass 1 metric ton (t) = 1000 kilograms (kg) 1 kilogram (kg) = 1000 grams (g) 1 hectogram (hg) = 100 grams (g) 1 dekagram (dag) = 10 grams (g) 1 gram (g) 1 decigram (dg) = 1 centigram (cg) = 1 milligram (mg) =

9. Copyright © 2015, 2010, and 2007 Pearson Education, Inc. 9 The mass of 1 raisin or 1 paperclip is approximately 1 gram (g). Since 1 metric ton is 1000 kg and 1 kg is about 2.2 lb, it follows that 1 metric ton (t) is about 2200 lb, or about 10% more than 1 American ton (T). 1 g 2 g 15 g 75 kg

10. 10 Copyright © 2015, 2010, and 2007 Pearson Education, Inc. Example Complete: 7 kg = ____ g. Solution Think: To go from kg to g is a move of 3 places to the right. Thus we move the decimal point 3 places to the right. 7.0 7.000. 7 kg = 7000 g 1000 g100 g10 g1 g0.1 g0.01 g0.001 g 1 kg1 hg1 dag1 g1 dg1 cg1 mg 3 places to the right

11. 11 Copyright © 2015, 2010, and 2007 Pearson Education, Inc. Example Complete: 8346 g = ____ kg. Solution To go from g to kg in the table is a move of 3 places to the left. 8346.0 8.346.0 8346 g = 8.346 kg 1000 g100 g10 g1 g0.1 g0.01 g0.001 g 1 kg1 hg1 dag1 g1 dg1 cg1 mg 3 places to the left

12. Copyright © 2015, 2010, and 2007 Pearson Education, Inc. 12 Microgram 1 microgram = 1 mcg = 1,000,000 mcg = 1 g

13. 13 Copyright © 2015, 2010, and 2007 Pearson Education, Inc. Example Complete: 2 mg = ____ mcg. Solution We convert to grams then to micrograms: 2 mg = 0.002 g = 0.002  1 g = 0.002  1,000,000 mcg = 2000 mcg

14. 14 Copyright © 2015, 2010, and 2007 Pearson Education, Inc. Example A physician prescribes 0.8-mg of a medication. How many micrograms are in each tablet? Solution Complete 0.8 mg = ____ mcg 0.8 mg = 0.8  1 mg = 0.8  1000 mg = 800 mcg From previous example, 1000 mcg = 1 mg