**Discuss the equivalent of:**

**SI system **

**1.1.1 SI Units of Length **

**Metric Length Equivalents**

** **The conversion factor between meter and kilometer is 1000. 1 km = 1000 m

The conversion factor between meter and millimeter is 1000. 1 m = 1000 mm

The conversion factor between meter and centimeter is 100. 1 m = 100 cm

The conversion factor between centimeter and millimeter is 10. 1 cm = 10 mm

**1.1.2 SI units of Volume 1 inch = 2.5 cm = 25 mm**

**Metric Volume Equivalents**

** **1 mL = 1 cc The conversion factor is 1.

1 L = 1000 mL The conversion factor is 1000.

1 L = 1000 cc The conversion factor is 1000.

**1.1.3 SI Units of Weight **

**Metric Weight Equivalents**

** **1 kg = 1000g The conversion factor is 1000.

1 g = 1000 mg The conversion factor is 1000.

1mg = 1000 mcg The conversion factor is 1000.

**2****Household System Units**

** ****Household System Units of Volume and their Equivalent **

** **__Unit Abbreviation Equivalent __

**Drop gtt **

**Teaspoon t or tsp 1t = 5mL **

**Table spoon T or tbs 1 T = 3tsp =15mL**

**Teacup**

**Glass**

** ****1.3** **Apothecaries’ System Equivalents**

** ****Symbolic Notation Meaning**

i = viii 1 ounce = 8 drams

pt i = z 16 1 pint = 16 ounces, 1 ounce = 30mL

qt i = pt ii 1 quart = 2 pints

gal i = qt iv 1 gal = 4 quarts

**1.4 British System Equivalents **

1 foot = 12 inches

1 yard = 3 feet = 36 inches

1 mile = 1760 yards

**Convert SI weight from one unit to another unit and SI volume from one unit to another unit.**

**Conversion of SI weight from one unit to another unit**

Convert the following:

**Convert 28.5 g into mg.**

**Solution:**

**Step– 1:** Equivalent?

As we know that 1 g = 1000mg conversion factor =1000.

**Step-2:** Multiply or divide?

Conversion is to smaller units. Multiply by the conversion factor.

28.5 g = 28.5 x 1000 = 28500 mg

Hence 28.5 g =28500 mg

**_________ kg = 135 g****Solution:**

**Solution:**

Step– 1: Equivalent?

As we know that 1 kg = 1000g conversion factor =1000.

Step-2: Multiply or divide?

Conversion is to larger units. Divide by the conversion factor.

135 g = 135 / 1000 = 0.135 kg

Hence __0.135__ kg = 135 g

**_________ g = 4.5 kg**

**Solution:**

Step– 1: Equivalent?

As we know that 1 kg = 1000 g conversion factor =1000.

Step-2: Multiply or divide?

Conversion is to smaller units. Multiply by the conversion factor.

4.5 kg = 4.5 x 1000 = 4500 g

Hence __4500 __g = 4.5 kg

** ****750 mg = _____ g**

**Solution:**

Step– 1: Equivalent?

As we know that 1 g = 1000mg conversion factor =1000.

Step-2: Multiply or divide?

Conversion is to larger units. Divide by the conversion factor.

750 mg = 750 / 1000 = 0.75 g

Hence 750 mg = __0.75__ g

**_____ mcg =0.4 mg**

**Solution:**

Step– 1: Equivalent?

As we know that 1 mg = 1000 mcg conversion factor =1000.

Step-2: Multiply or divide?

Conversion is to smaller units. Multiply by the conversion factor.

0.4 mg = 0.4 x 1000 = 400 mcg

Hence __400 __mcg = 0.4 mg

On the Job Practice |

** **Convert the tablet dosage strength as indicated:

- Paracetamol 500 mg tablet ______ g
- Triamcilone 4 mg tablet ______ g
- Codeine sulfate 0.03 g tablet ______ mg
- Morphine sulfate 0.015 g tablet ______ mg
- A premature baby, born before the 37-38 week of gestation, has a birth weight of less than 2.5 kilograms. 2.5 kg = _____ g

**Conversion of SI Volume from one unit to another unit**

**2.85 L = _____ mL**

Step– 1: Equivalent?

As we know that 1 L = 1000 mL conversion factor =1000.

Step-2: Multiply or divide?

Conversion is to smaller units. Multiply by the conversion factor.

2.85 L = 2.85 x 1000 = 2850 mL

Hence 2.85 L = __2850__ mL

**750 mL = ____ L**

Step– 1: Equivalent?

As we know that 1 L = 1000 mL conversion factor =1000.

Step-2: Multiply or divide?

Conversion is to larger units. Divide by the conversion factor.

750 mL = 750 / 1000 = 0.75 L

Hence 750 mL = __0.75__ L

**____ cc = 0.85 L**

Step– 1: Equivalent?

As we know that 1 L = 1000 cc conversion factor =1000.

Step-2: Multiply or divide?

Conversion is to smaller units. Multiply by the conversion factor.

0.85 L = 0.85 X 1000 = 850 cc

Hence __850 __cc = 0.85 L

**____ mL = 25 cc**

Step– 1: Equivalent?

As we know that 1 mL = 1 cc conversion factor = 1

Step-2: Multiply or divide?

The Conversion is to the same size unit. The quantity of cubic centimeter will be equal to the quantity of milliliters.

Hence 25 mL = 25 cc.** **

On the Job Practice |

** **The normal daily intake of fluid for an adult is about 1500- 2000 milliliters. Express this average in liters.

______ L = ______ L

- The average capacity of an adult urinary bladder is about 500 cc.

500 cc = _____ mL = _____ L

- The average adult excretes about 1200 – 1500 cc of urine every 24 hours. Express this range in milliliters first, then in liters.

1200 cc = _____ mL = _____ L

1500 cc = _____ mL = _____ L

- A given syringe holds 3cc of medication. The capacity of the syringe could be stated as _____ mL.
- A certain tuberculin syringe has a capacity of 0.5 mL. What is the volume of this syringe in cc. ____ cc.

**Convert kilogram to pound and pound to kilogram**

**Conversion between metric and English system **

**Convert 154 pounds to kilograms.**

Step– 1: Equivalent?

As we know that 1 kg = 2.2 lb conversion factor =2.2.

Step-2: Multiply or divide?

Conversion is to larger units. Divide by the conversion factor.

154 lb = 154 ÷ 2.2 = 70 kg

Hence 154 lb = 70 kg

**Convert 15.5 kilogram to pounds.**

Step– 1: Equivalent?

As we know that 1 kg = 2.2 lb conversion factor =2.2.

Step-2: Multiply or divide?

Conversion is to smaller units. Multiply by the conversion factor.

15.5 kg = 15.5 X 2.2 = 34.1 lb

Hence 15.5 kg = 34.1 lb

On the Job Practice |

**Solve simple word problems based on these measurement systems.**

The weights of three patients were recorded. Convert the units.

- 196 pounds = _____ kg
- 157 pounds = _____ kg
- 61 kilograms = _____ lb