Chapter 5: Conversions Within Measurement Systems

Question 1

What is the Conversion Factor?

Answer 1

A ratio equal to 1, used to change one unit to another without changing the value of the measurement.

Question 2

What is Dimensional Analysis (DA)?

Answer 2

A method used for converting between units by multiplying fractions, canceling unnecessary units until the desired unit is reached.

Question 3

What is Ratio and Proportion (R&P)?

Answer 3

A method for single-step conversions between units involving cross-multiplication and division to solve for the unknown.

Question 4

List the steps for solving conversions using R&P.

Answer 4

1. Identify the unknown unit.
2. Find the known equivalent.
3. Set up a fraction with the known equivalent on one side.
4. Set up a fraction with the unknown unit on the other side.
5. Cross-multiply and divide to solve.

Question 5

Steps for solving conversions using Dimensional Analysis (DA).

Answer 5

1) Identify the unit of the answer needed.

2) Set up a fraction with the desired unit in the numerator.

3) Set up the next fraction so the units cancel.

4) Multiply and cancel until the desired unit remains.

Question 6

How many teaspoons (tsp) are in 1 tablespoon (Tbsp)?

Answer 6

3 tsp = 1 Tbsp

Question 7

How many tablespoons are in 1 ounce (oz)?

Answer 7

2 Tbsp = 1 oz

Question 8

How many ounces are in 1 cup (c)?

Answer 8

8 oz = 1 c

Question 9

Convert 1 pint (pt) to cups (c).

Answer 9

1 pt = 2 c

Question 10

Convert 1 quart (qt) to pints (pt).

Answer 10

1 qt = 2 pt

Question 11

Convert 1 gallon (gal) to quarts (qt).

Answer 11

1 gal = 4 qt

Question 12

How many grams (g) are in 1 kilogram (kg)?

Answer 12

1 kg = 1,000 g

Question 13

How many milligrams (mg) are in 1 gram (g)?

Answer 13

1 g = 1,000 mg

Question 14

How many micrograms (mcg) are in 1 milligram (mg)?

Answer 14

1 mg = 1,000 mcg

Question 15

How many milliliters (mL) are in 1 liter (L)?

Answer 15

1 L = 1,000 mL

Question 16

When converting from a larger metric unit to a smaller one, do you multiply or divide?

Answer 16

Multiply (e.g., 1 kg = 1,000 g).

Question 17

When converting from a smaller metric unit to a larger one, do you multiply or divide?

Answer 17

Divide (e.g., 500 mg = 0.5 g).

Question 18

Convert 1 kilogram (kg) to milligrams (mg).

Answer 18

1 kg = 1,000,000 mg

Question 19

Convert 1.2 liters (L) to milliliters (mL).

Answer 19

1.2 L = 1,200 mL

Question 19

Convert 5.6 kg to mg.

Answer 19

5.6 kg = 5,600,000 mg

Question 20

Convert 0.005 grams (g) to milligrams (mg).

Answer 20

0.005 g = 5 mg

Question 21

Convert 0.002 kg to grams (g).

Answer 21

0.002 kg = 2 g

Question 22

Convert 6.54 kg to mg using the DA method.

Answer 22

6.54 kg = 6,540,000 mg

Question 23

What is the main unit of mass in the Apothecary System?

Answer 23

The grain (gr).

Question 24

How many grains (gr) are approximately equal to 1 gram?

Answer 24

1 gr ≈ 60 mg

Question 25

How many fluid drams (fl ʒ) are in 1 fluid ounce (fl oz)?

Answer 25

8 fl ʒ = 1 fl oz

Question 26

Convert 4 fluid ounces (fl oz) to fluid drams (fl ʒ).

Answer 26

4 fl oz = 32 fl ʒ

Question 27

Convert 15 grains (gr) to milligrams (mg).

Answer 27

15 gr = 900 mg

Question 28

Convert 60 drops (gtt) to teaspoons (tsp).

Answer 28

60 gtt = 1 tsp

Question 29

Convert 45 micrograms (mcg) to milligrams (mg).

Answer 29

45 mcg = 0.045 mg

Question 30

Convert 0.25 grams (g) to milligrams (mg).

Answer 30

0.25 g = 250 mg

Question 31

What is the shortcut rule for converting between metric units?

Answer 31

Move the decimal point by 3 places for each 1,000-fold difference.

Question 32

What is the primary use of Dimensional Analysis (DA) in pharmacy?

Answer 32

To handle multistep conversions between units in pharmaceutical calculations.

Question 33

What is the primary method to handle single-step conversions?

Answer 33

Ratio and Proportion (R&P), using cross-multiplication.

Question 34

What is the abbreviation for teaspoon?

Answer 34

tsp

Question 35

What is the abbreviation for tablespoon?

Answer 35

Tbsp

Question 36

What is the abbreviation for pound?

Answer 36

lb or #

Question 37

What is the abbreviation for ounce?

Answer 37

oz

Question 38

What should you use instead of cc for volume to avoid confusion?

Answer 38

mL (milliliters)

Question 39

How many ounces (oz) are in 1 pound (lb)?

Answer 39

16 oz = 1 lb

Question 40

What is the conversion for 1 Tbsp to teaspoons (tsp)?

Answer 40

1 Tbsp = 3 tsp

Question 41

What is the abbreviation for grain in the Apothecary system?

Answer 41

gr

Question 42

How many micrograms (mcg) are in 0.25 milligrams (mg)?

Answer 42

250 mcg

Question 43

Convert 1.75 L to mL.

Answer 43

1.75 L = 1,750 mL

Question 44

Convert 36 kg to grams (g).

Answer 44

36

Question 45

How many quarts (qt) are in 6 pints (pt)?

Answer 45

6 pt = 3 qt

Question 46

Convert 0.125 mg to micrograms (mcg).

Answer 46

0.125 mg = 125 mcg

Question 47

How many milliliters (mL) are in 0.5 liters (L)?

Answer 47

0.5 L = 500 mL

Question 48

Convert 58,400 mL to liters (L).

Answer 48

58,400 mL = 58.4 L

Question 49

Convert 0.05 grams (g) to milligrams (mg).

Answer 49

0.05 g = 50 mg

Question 50

Convert 24 ounces (oz) to cups (c).

Answer 50

24 oz = 3 cups

Question 51

Convert 1 Tbsp to mL.

Answer 51

1 Tbsp ≈ 15 mL

Question 52

Convert 3.75 liters (L) to milliliters (mL).

Answer 52

3.75 L = 3,750 mL

Question 53

How many gallons (gal) are in 32 ounces (oz)?

Answer 53

32 oz = 0.25 gal

Question 54

What is the rule for moving the decimal when converting from a smaller metric unit to a larger metric unit?

Answer 54

Move the decimal point to the left by 3 places or divide by 1,000.

Question 55

Convert 6 cups to ounces (oz).

Answer 55

6 cups = 48 oz

Question 56

Convert 45 gtt (drops) to tsp.

Answer 56

45 gtt ≈ 0.75 tsp

Question 57

How many fluid drams are in 4 fluid ounces?

Answer 57

4 fl oz = 32 fl drams

Question 58

What are the most common weight units used in pharmacy in the metric system?

Answer 58

Kilogram (kg), gram (g), milligram (mg), microgram (mcg).

Question 59

What are the most common volume units used in pharmacy in the metric system?

Answer 59

Liter (L) and milliliter (mL).

Question 60

Convert 500 mL to liters (L).

Answer 60

500 mL = 0.5 L

Question 61

How many pints (pt) are in 4 cups (c)?

Answer 61

4 cups = 2 pints

Question 62

What is the apothecary system symbol for fluid ounce?

Answer 62

The symbol for fluid ounce is fl ℥.

Question 63

How do you convert grains (gr) to milligrams (mg)?

Answer 63

Multiply the number of grains by approximately 60 to get milligrams (e.g., 1 gr ≈ 60 mg).

Question 64

Convert 125 mg to grams (g).

Answer 64

125 mg = 0.125 g

Question 65

Convert 0.5 mg to grams (g).

Answer 65

0.5 mg = 0.0005 g

Question 66

What should be used to measure liquid medications at home?

Answer 66

Calibrated medication cups or oral syringes should be used to measure liquid medications at home.

Question 67

Convert 2.5 grams (g) to milligrams (mg).

Answer 67

2.5 g = 2,500 mg

Question 68

Convert 3.56 grams (g) to milligrams (mg).

Answer 68

3.56 g = 3,560 mg

Question 69

How many milliliters (mL) are in 8 ounces (oz)?

Answer 69

8 oz = 240 mL

Question 70

Convert 0.04 kg to grams (g).

Answer 70

0.04 kg = 40 g

Question 71

Convert 2 gallons to quarts.

Answer 71

2 gallons = 8 quarts

Question 72

Convert 2 quarts to liters (L).

Answer 72

2 quarts ≈ 1.89 liters (L)

Question 73

What are the most common units of mass in the apothecary system?

Answer 73

Grain (gr) and dram (ʒ).

Question 74

How do you convert between metric and household systems?

Answer 74

Use conversion factors such as 1 tsp = 5 mL, 1 oz = 30 mL, and 1 cup = 240 mL.

Question 75

Convert 0.5 tsp to milliliters (mL).

Answer 75

0.5 tsp = 2.5 mL

Question 76

Convert 250 mg to grams (g).

Answer 76

250 mg = 0.25 g