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Dimensional Analysis for Meds. Chapter 4. Chapter 4. Metric, International (SI) System You do not need to know all of the System! Much easier than English System All units of measure differ from teach other in powers of ten (10).
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Dimensional Analysis for Meds Chapter 4
Chapter 4 • Metric, International (SI) System • You do not need to know all of the System! • Much easier than English System • All units of measure differ from teach other in powers of ten (10). • Conversions between units in the system are accomplished by simply moving the decimal point.
English Lengths • 12 inches = 1 foot • 3 feet = 1 yard • 5 ½ yards = 1 rod • 40 rods = 1 furlong • 8 furlongs = 1 mile
English Weights • 27 11/32 grains = 1 dram • 16 drams = 1 ounce • 16 ounces = 1 pound • 200 pounds = 1 ton
English Volumes • 2 pints = 1 quart • 4 quarts = 1 gallon • 31 ½ gallows = 1 barrel • 2 barrels = 1 hogshead
English Lengths • 12 inches = 1 foot • 3 feet = 1 yard • 5 ½ yards = 1 rod • 40 rods = 1 furlong • 8 furlongs = 1 mile • 500 inches x 1 foot/12 inches = 41.67 feet • 500 in x 1 ft/12 in x 1 yrd/3 ft = 13.89 yards • If you have a piece of sting that is 500 inches long, how many feet is that? How many yards?
Metric System • 3 Basic words • Meter = length • Gram = weight • Liter = volume • It does not mater what prefix you have.
Milligram Centimeter Milliliter Kilometer Microgram L = Length W = Weight V = Volume Small Group Quiz!
Small Group Quiz! • Milligram = (W) weight • Centimeter = (L) length • Milliliter = (V) volume • Kilometer = (L) length • Microgram = (W) weight
Metric prefixes • Same prefix for length, volume, weight. • Kilogram • Kiloliter • Kilometer
Kilo • Kilo • Prefix • Larger than basic by 1000 • 1 kilometer = 1000 meters • 1 kilogram = 1000 grams • 1 kiloliter = 1000 liters
3 Prefixes (smaller than basic) • Centi – ( centimeter) 100x smaller than basic • Milli – (Millimeter) 1000x smaller than basic • Micro (microgram) 1,000,000x smaller than basic
1 Kilometer = • 1000 meters • 1 meter = • 1000 millimeters • 1 millimeter = • 1000 micrometer
1 Kilogram = • 1000 gram • 1 gram = • 1000 milligram • 1 milligram = • 1000 microgram
Kiloliter = • 1000 Liter • 1 Liter = • 1000 milliliter • 1 milliliter = • 1000 microliter
Basic unit Meter = m Liter = L Gram = g Prefix Kilo = k Kiloliter = kL Centi = c Centimeter = cm Milli = m Millimeter = mm Micro = mc Microgram – mcg Symbols
Rules! • mL = cc • Do not chart • Microgram = mg • Do not chart
Small group Quiz • Write the following in abbreviated form • Microgram • Milliliter • Kilometer • Kilogram • Microliter • Centimeter
Small group Quiz • Write the following in abbreviated form • Microgram = mcg • Milliliter = mL • Kilometer = km • Kilogram = kg • Microliter = mcL • Centimeter = cm
Metric System & Meds • Only use dosages that differ by 1000 units to the next measurement
Conversions between units • Conversion between units are accomplished by moving the decimal point! • How far? (How many places)? • How many “0” in 1000? • 3 • Move the decimal point 3 places
Conversions between units • Which direction do you move the decimal point? • IF large units to small units • The quantity (number) must get larger • Large smaller • Move the decimal to the right • 0.5 g = __?__ mg • g to mg is a difference of 1000 units • Kg g mg mcg • Large smaller • 500 mg
Conversions between Units • 2.5 L = __?__ mL • L to mL is a difference of 1000 units • L mL • Large small • 2500 mL • 500 mg = __?__ mcg • mg to mcg is a difference of 1000 units • Kg g mg mcg • Large small • 500,000 mcg
Small Group Practice • 9 mg = ___?___ mcg • 2.3 L = ___?___ mL • 0.09 kg = ___?___ g • 4.7 g = ___?___ mg • 0.75 kg = ___?___ g
Small Group Practice • 9 mg = 9000 mcg • 2.3 L = 2300 mL • 0.09 kg = 90 g • 4.7 g = 4700 mg • 0.75 kg = 750 g
Conversions between Units • What if we are converting up the scale, going from smaller larger units? • Move the decimal point 3 places to the Left • 200 mL = ___?___ L • mL to L is different of 1000 units • L mL • Smaller larger • 0.2 L
Conversions between Units • 50 mcg = ___?___ mg • mcg to mg is different of 1000 units • Kg g mg mcg • Smaller larger • 0.05 mg
Small group Practice • 4200 mL = ___?___ L • 520 mg = ___?___ g • 30 mcg = ___?___ mg • 7420 g = ___?___kg • 2.2 L = ___?___ mL
Small group Practice • 4200 mL = 4.2 L • 520 mg = 0.52 g • 30 mcg = 0.03 mg • 7420 g = 7.42 kg • 2.2 L = 2200 mL