dimensional analysis for meds
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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). - PowerPoint PPT PresentationTRANSCRIPT
Dimensional Analysis for Meds
Chapter 4
Chapter 4
Metric, International (SI) SystemYou do not need to know all of the System!Much easier than English SystemAll 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 wordsMeter = lengthGram = weightLiter = volume
It does not mater what prefix you have.
Small Group Quiz!
1. Milligram
2. Centimeter
3. Milliliter
4. Kilometer
5. Microgram
L = Length
W = Weight
V = Volume
Small Group Quiz!
1. Milligram = (W) weight
2. Centimeter = (L) length
3. Milliliter = (V) volume
4. Kilometer = (L) length
5. Microgram = (W) weight
Metric prefixes
Same prefix for length, volume, weight.KilogramKiloliterKilometer
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
Symbols
Basic unitMeter = mLiter = LGram = g
PrefixKilo = k
Kiloliter = kL
Centi = c Centimeter = cm
Milli = m Millimeter = mm
Micro = mc Microgram – mcg
Rules!
mL = ccDo not chart
Microgram = gDo not chart
Small group Quiz
Write the following in abbreviated form1. Microgram2. Milliliter3. Kilometer4. Kilogram5. Microliter6. Centimeter
Small group Quiz
Write the following in abbreviated form1. Microgram = mcg2. Milliliter = mL3. Kilometer = km4. Kilogram = kg5. Microliter = mcL6. Centimeter = cm
Metric System & Meds
Only use dosages that differ by 1000 units to the next measurement
Weight Volume1 kg = 1000 g 1 L = 1000 mL
1 g = 1000 mg
1 mg = 1000 mcg
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
1. 9 mg = ___?___ mcg
2. 2.3 L = ___?___ mL
3. 0.09 kg = ___?___ g
4. 4.7 g = ___?___ mg
5. 0.75 kg = ___?___ g
Small Group Practice
1. 9 mg = 9000 mcg
2. 2.3 L = 2300 mL
3. 0.09 kg = 90 g
4. 4.7 g = 4700 mg
5. 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
1. 4200 mL = ___?___ L
2. 520 mg = ___?___ g
3. 30 mcg = ___?___ mg
4. 7420 g = ___?___kg
5. 2.2 L = ___?___ mL
Small group Practice
1. 4200 mL = 4.2 L
2. 520 mg = 0.52 g
3. 30 mcg = 0.03 mg
4. 7420 g = 7.42 kg
5. 2.2 L = 2200 mL