FRAME 4-33.
Solution to
The following chart shows conversions using U.S. weights. The weights
Frame 4-32.
are the avoirdupois system, which is the common weighing system for
commerce. There are other systems of weights such as the
a. 0.35
apothecaries' (for pharmacy) and troy (used for precious metals such as
gold). The avoirdupois, apothecaries' weight, and troy weight systems
b. 1.285
are based upon the grain, which is the same in all three systems. In the
avoirdupois system, a pound equals 7,000 grains and is divided into 16
c. 250
ounces. In the apothecaries' and troy systems, a pound equals 5,760
grains and is divided into 12 ounces.
d. 1,000,000
Avoirdupois
e. 2200
Grain
Ounce
Pound
Metric
f. 1.12
1
0.0023
0.00014
64.8 mg
437.5
1
0.0625
28.35 g
7,000
16
1
454 g (0.454 kg)
Apothecaries' System of Weights
1 grain = 64.8 milligrams
20 grains = 1 scruple (1.3 grams)
3 scruples = 1 dram (3.9 grams)
8 drams = 1 ounce (31.1 grams)
12 ounces = 1 pound (373 grams)
Troy System of Weights
1 grain = 64.8 mg
480 grains = 1 ounce (31.1 grams)
12 ounces = 1 pound (373 grams)
a. Which is heavier, an ounce of iron (avoirdupois weight) or a ounce
of gold (troy weight)?
b. Which is heavier, a pound of iron (avoirdupois weight) or a pound
of gold (troy weight)?
NOTE: The U.S. weights used in Frame 4-32 are the common
avoirdupois weights.
NOTE: In this subcourse, the avoirdupois system of weights is used
when referring to the U.S. Customary System of weights.
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MD0900
4-16