Date post: | 23-Dec-2015 |
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House
hold
Syste
m
O Most familiar in the United States
O Units can be converted among themselves
O Unknown measures can be determined
using proportions or dimensional analysis
BASE Units O Distance/length – inch, foot, yard, mile
O Capacity/volume – drop, teaspoon, tablespoon, ounce, cup, pint, quart, gallon
O Mass/weight – ounce, pound
Metric S
yste
m
O Used outside the United States.
O More accurate
O Based on units of 10 (easier to convert between units)
BASE Units
O Distance/length – meters
O Capacity/volume – liters, ml
O Mass/weight – grams
“You are to give a patient 1.5 oz. of Pepto Bismal. How many
Tbls. should the patient take?“Step 1: Look up the conversion for ounces to tablespoons.
1 oz. = 2 Tbls.
Step 2: Set up the proportion
2 Tbls x 1.5 oz 1 oz.
Step 3: Solve the problem by multiplying and dividing.
2 x 1.5 = 3 Tbls.
The correct answer is 3 Tbls.
You need to take 450 mcg of aspirin and you have 0.3mg tablets. How many tablets should you take?
450mcg x 1mg 0.3mg 1000mcg
450 x 1 0.3 x 1000
450300
1.5 tablets
A dose of 1.75g is ordered, but the drug comes in 500mg scored tablets. How many tablets should be given?
1.75 g x 1000 mg500 mg 1 g
1.75 x 1000 500 mg
1750 mg 500 mg
3.5 tablets
How many Tbls. are in a 500 mL bottle of cough syrup?
500 mL x 1 Tbls x 1 tsp 1 bottle 3 tsp. 4.93 mL
You know 3 tsp = 1 Tbls and 1 tsp. = 4.93mL so set it up…
500 x 1 x 1 = 500 1 x 3 x 4.93 14.79
33.81 Tbls per bottle