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Chapter 9

Chapter 9 . Measurement Systems. 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. Measurement Systems. Avoirdupois Apothecary

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Chapter 9

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  1. Chapter 9 Measurement Systems

  2. 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.

  3. Measurement Systems Avoirdupois Apothecary Household Metric

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

  5. 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

  6. 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?

  7. Metric System Kilo Thousands Deci Tenths Centi Hundredths Milli Thousandths Micro Millionths

  8. 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?

  9. 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

  10. 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

  11. 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.

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

  13. Converting from One Unit to Another Grams to kilograms Divide by 100 Grams to milligrams Multiply by 100 Kilograms to grams Multiply by 1,000 Milligrams to grams Divide by 1,000 Liters to milliliters Multiply by 1,000 Milliliters to liters Divide by 1,000

  14. 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

  15. 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.

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