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29 Cards in this Set
- Front
- Back
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This chapter is about learning how to convert from metric to apothecary to household so we don't kill nobody. Plus what?
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how to convert equivilants WITHIN the same systems!
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the big problem is grains.
some say 60 or 65 mg = gr 1. But what does this book want us to remember? |
60 mg = gr 1
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what is converting?
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1)changing from one equiv to another equiv within the same system
2) changing equivs from one system to another system |
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measurements made after a conversion leaves us with a ...
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an approximation, not exact. so?
so there are certain equivs established to ensure continuity. |
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some points for the nurse in making conversions
Memorize equivilents is crucial! What is a conversion factor? |
1,000 mg = 1 g
thus is called a conversion factor. |
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another point is to follow basic math principles regardless of the conversion method used.
Which system uses decimals? Which system uses fractions? |
metric system uses decimals
apothecary system uses fractions remember this ! |
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metric systems, based on decimal points, are easy to convert b/t them from millis to megas by floating the decimal point right or left. Why can't you use this with apothecary or household evivilant changes?
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apothecary & household doesn't use decimal points!
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there are 2 rules in moving decimal points: what are they?
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1) to convert a small to large, ÷ or move the decimal point to the left
2) to convert a large to a small, ∙ (mult) or move the decimal point to the right. |
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MEMORIZE THESE EQUIVILANTS!
apothecary to metric m15 or 16 = ? mL |
metric to apothecary
1 mL = m 15 or m 16 |
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apothecary to metric
dr 1 (3i) = ? mL |
metric to apothecary
4 mL = ? dr (3i) 3 means dram |
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household to metric
1 t (1 tsp) = ? mL |
metric to household
5 mL = ? t (1 tsp) |
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household to metric
1 T (1tbs) = ? mL |
metric to household
15 mL = ? T (tbs) |
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apothecary to metric
gr 15 = ? g |
metric to apothecary
1 g (1,000 mg) = ? gr |
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apothecary to metric
gr i = ? mL |
metric to apothecary
60 mL = ? gr |
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apothecary to metric
1 oz (ˆ3i) = ? mL |
metric to apothecary
30 mL = 1 oz (ˆ3i) |
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apothecary to metric
1 pt (16 oz.) = ? mL |
metric to apothecary
500 mL = ? pt |
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apothecary to metric
1 qt (32 oz) = ? mL |
metric to apothecary
1,000 mL or 1L = ? qt |
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apothecary to metric
2.2 lb = ? kg |
metric to apothecary
1 kg (1,000g) = ? lb |
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one of the easiest ways to make a conversion is using ...
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ratio - proportion
written in colon format Can be written in colon format or as a fraction when making the conversion |
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5 rules for ratio-proportion conversions:
1) state the know equiv. (from memory) 2) add imcomplete ratio on the other side of the equal sign, making sure the units are in the same sequence: Ex. ----> |
mg : g = mg : g
same sequence here, right? |
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3) label all terms in the proportion, including x
ignore ... |
these labels are ignored when multiplying or dividing
----------- -------- |
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4) solve problem by using principles for solving ratio-proportions.
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the product of the means = the product of the extremes
Ex 3 : X = 4 : 1 the extremes are 3 & 1 the means are X & 4 |
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5) the final answer for X should be labeled w/ the appropriate unit of measure or desired unit.
like duh |
Ex. 8 mg = ________ g
solution: 1) state the known equiv. first (put it on one side) 2) add the incomplete ratio, make sure units in same sequence!!! 3) label all terms in the proportion, including x 1,000 mg : 1 g = 8 mg : x g (known equiv.) (unkown) (read 1,000 mg is to 1 g as 8 mg is to X g) now do the math...means = extremes x = 8/1,000 |
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you see this equation:
8 mg = ____ g what is the first thing you should notice? |
that the conversion is going from smaller to larger, thus division or moving the decimal to the left.
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whats the next thing you notice?
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the units are going from mg to g, thus changing by 1,000 NOT 100 or 10,000, but 1,000.
This is a BIGGY!!! |
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What else do you realize looking at 8 mg = _______g ?
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that you will have to move the decimal point to the left 3 places to complete this conversion 8 mg = 0.0008 g
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an alternate version is the one I learned in Algebra...
1,000 mg/1g = 8mg/xg and do the math... |
x = 0.0008 g
8/1,000 = 0.008 |
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Now converting w/in the same system!
metric to metric Ex. 0.6 mg = _______mcg |
600 mcg
its an equivilant too. 0.6 mg = 600 mcg it easy! |
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Quick ...
1 dram = ? mL |
1 dram = 4 mL
memorize this |
