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

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

OBJECTIVES Copyright © 2015, 2011, and 2008 Pearson Education, Inc 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.

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

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.

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) =

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 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 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 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 g = 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

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

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

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