![]() The meter is the unit of length the liter, of volume and the gram, of weight. Metric system The decimal system of measure widely used for prescribing and administering medication.Įach table of the metric system contains a definitive unit. It is accepted by scientists the world over because its tables are simple, because they are based on the decimal system of notation, and because the greater of two consecutive denominations of the same kind is always 10 times the lesser. By act of Congress in 1893, it became our legal standard of measure, and all other systems have been referred to it for official comparison (including the United States’ customary system of measurement-pounds, yards, and so on) ever since. Its use in the United States was legalized (but not made mandatory) in 1866. The metric system of measure was formulated in France in the late 18th century. The avoirdupois system will also be mentioned in relation to bulk and stock powdered chemicals and drugs. The apothecaries’ system has been almost totally replaced by the metric system, but some medications are still being ordered in grains, and some manufacturers continue to label certain medications in grains. A brief review of the apothecaries’ system is included. The second focus of this chapter is to familiarize the technician student with the household system of measure and conversions between it and the metric system. ![]() The major focus of this chapter is to make the metric system, particularly as it is used in the practice of pharmacy, and converting measures within this system, habit to the technician student. Medication is primarily manufactured, ordered, and prepared in the metric system.
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