NTA Level 4 • Semester 1 • PST04105

Calculations of Unit of Measure Relating to Weight

Pharmaceutical Calculations • Source Session/Topic 3

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Session 3: Calculations of Unit of Measure Relating to Weight

Total Session Time: 120 minutes

Prerequisites

• None

Learning Tasks

By the end of this session students are expected to be able to:

• Define the unit of measure of weight

• Convert different measures of weight

Resources Needed:

• Flip charts, marker pens, and masking tape

• Black/white board and chalk/whiteboard markers

SESSION OVERVIEW

SESSION CONTENTS

STEP 1: Presentation of Session Title and Learning Tasks (5 minutes)

READ or ASK students to read the learning tasks and clarify

ASK students if they have any questions before continuing.

STEP 2: Unit of Measure of Weight (50 minutes)

|Activity:Demonstration (30 minutes) |

| |

|DIVIDE students in small manageable groups. |

| |

|PREPARE equipment and materials needed for demonstration |

| |

|POSITION students so that everyone can see and hear |

| |

|REVIEW steps of that skill with students. |

| |

|DEMONSTRATE |

|The procedures of measuring weight by using different weighing scales |

|ALLOW one student from each group to do a return demonstration and let |

|others comment on it |

|CLARIFY and SUMMARIZE by using the content below |

• Weight: A body’s relative mass or the quantity of matter contained by

it, giving rise to a downward force or heaviness.

• The unit of weight in the metric system is the Gram (g)

• There are two most common measurements of weight: milligram and gram

• The selection of measuring of weight depends on the quantity of the

substance to be weighed and the sensitivity and accuracy of the weighing

scale (instrument)

• Examples of commonly used weighing scales in the pharmacy practice are

electronic balance, analytical balance and beam balance

• The selection of weighing balances depends on the task at hand, from

highly sensitive electronic analytic balances and prescription balances

in extemporaneous compounding procedures to large-capacity scales in the

industrial manufacturing and production of pharmaceutical products

• Each instrument used must meet the established standards for sensitivity,

accuracy and capacity

STEP 3: Different Measures of Weight (30 Minutes)

|Activity: Small Group Discussion ( 20 minutes) |

| |

|DIVIDE students into small manageable groups |

| |

|ASK students to discuss on the following question |

|What are the different measures of weight? |

| |

|ALLOW students to discuss for 15 minutes |

| |

|ALLOW few groups to present and the rest to add points not mentioned |

| |

|CLARIFY and SUMMARIZE by using the contents below |

• The following are the different measures of weight:

o 1 kilogram (kg)= 1000 gram

o 1 hectogram (hg)= 100 gram

o 1 dekagram (dag)= 10 gram

o 1 gram (g)= 1gram

o 1 decigram (dg) = 0.1 gram

o 1 centigram (cg) = 0.01 gram

o 1 milligram (mg) = 0.001 gram

o 1 microgram (µg) = 0.000,001 gram

Table 1: Measures of Weight

|Name of Unit |Unit symbol |Equivalent to |

|1 kilogram |Kg |1000g |

|1 gram |G |1000mg(0.001kg) |

|1 milligram |Mg |1000mcg(0.001g) |

|1 microgram |Mcg |1000ng(0.001mg) |

|1 nanogram |Ng |1000pg(0.001µg) |

STEP 4: KeyPoints (15 minutes)

• There are two most common measurements of weight: milligram and gram

• Milligram is often written as mg and gram as g

• One gram is comprised of 1000 milligram (1 g= 1000mg)

STEP 5: Evaluation (20 minutes)

• What are the units of measure of weight?

• Convert the following units of measure of weight into milligram; 250g,

0.003kg, 7.4 g, 10g , 188000µg and 100g

References

Ansel, H. C & Stocklosa, M. J. (2001). Pharmaceutical Calculations (11th

ed.). Philadelphia, United States: LIPPINCOTT WILLIAMS & WILKINS

Ansel, H. C (2010) Pharmaceutical Calculations (13rd ed.). Philadelphia,

United States: LIPPINCOTT WILLIAMS & WILKINS

Senya, S. S, Mwasha, C.Y, Muyinga, A. M, Amiri,R. I. and Mauga E.A.S.K.

(2011) Tanzania Pharmaceutical Handbook (2nd ed.). Dar eS Salaam,

Tanzania: School of Pharmaceutical Sciences.

Zatz, J.L and Teixeira, M.G. (2005). Pharmaceutical Calculation (4th ed.).

New Jersey: John Wiley & Sons, Inc

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