1. Chapter 9 Measurement Systems

3. Objectives  Define all key terms.  Compare three systems of measurement used for drug dosages.  State the basic units of measurement in the metric system.  Correctly convert between the systems of measurement.

4. Measurement Systems  Avoirdupois  Apothecary  Household  Metric

5. Critical Thinking  Would you rather be weighed in kilograms or pounds? Why?

6. Household Measures  3 t = 1 T  2 T = 1 fluid oz  8 oz = 1 cup  2 cups = 1 pint  4 quarts = 1 gallon  1 juice glass = 4 oz  1 teacup = 6 oz  1 glass = 8 oz

7. Critical Thinking  Does it bother you that 1 oz = something between 360 and 480 gtts, minims, or grains? What does this say about the accuracy of this system?

8. Metric System  KiloThousands  Deci Tenths  Centi Hundredths  MilliThousandths  MicroMillionths

9. Critical Thinking  Do you have trouble seeing the decimal point? Do you think pharmacists ever do? How can you be sure that a patient is given 0.5 gram instead of 5 grams?

10. Converting from One Unit to Another  Kilo × 1000 to get to unit  Centi divided by 100 to get to unit  Milli divided by 1,000 to get to unit  Micro divided by 1,000,000 to get to unit

11. Conversions  1 gram = 1,000 mg  1 gram = 15 grains  1 grain = 60 mg  1 mg = 1/1,000 gram  1 grain = 1/15 gram  1 mg = 1/60 grain

12. King Gram Story  King Gram had 1,000 servants named mg.  King Gram owned 15 grain fields.  In each grain field, 60 mg worked.  Each mg is 1/1,000 of the workforce.  If one mg is sick, 1/60 of the workforce in the grain field is sick.  If King Gram gives away 1 grain field, that is 1/15 of his wealth.

13. Question  Students, can you recite the King Gram story?  Or would you prefer to memorize the conversions?

14. Converting from One Unit to Another  Grams to kilogramsDivide by 100  Grams to milligrams Multiply by 100  Kilograms to gramsMultiply by 1,000  Milligrams to gramsDivide by 1,000  Liters to millilitersMultiply by 1,000  Milliliters to litersDivide by 1,000

15. Converting through 1 oz  1 oz = 2 T  1 oz = 6 t  1 oz = 8 drams  1 oz = 360–480 gtts, grains, minims  1 oz = 30 mL

16. Summary  What new piece of information in this chapter were you most interested to learn?  What questions do you still have about the information in this chapter?  Return to Objectives to determine extent of learning.Objectives

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