In the metric system the liter is a unit of capacity equivalent to the volume occupied by the mass of 1 kilogram of pure water at its maximum density. It is equivalent in volume to 1.000027 cubic decimeter. Under this definition a milliliter (0.001 of a liter) is different from a cubic centimeter by a very minute fraction. However, as cubic centimeter is the term used throughout medical literature we shall use it in this book, though both the U. S. and British Pharmacopoeias have adopted the term milliliter (mil) in its place.

A. Metric

Weight

Written

Approximate Equivalent

1

milligram (mg.)...........................

0.001

1/65

grain

10

milligrams = 1 centigram (cg.)...............

0.01

1/6

grain

10

centigrams = 1 centigram (cg) ........................................

0.1

1 1/2

grains

10

decigrams = 1 gram (gm.)...................

1.0

15

grains

1000

grams = 1 kilogram (kilo.)..................

1000.0

2 1/5

pounds

Volume

1

milliliter (mil.) ..................................................................

1.0

15

minims

1

cubic centimeter (c.c.) ......................................................

(1 c.c. of water weighs 1 gm.)

1.0

15

minims

1000

cubic centimeters = 1 liter (L.)...............

1000.0

34

fluidounces

Length

1

millimeter (mm.) ................................................................................

1/25

inch

10

millimeters = 1 centimeter (cm.)........................

2/5

inch

10

centimeters = 1 decimeter (dm.) ............................................................

4

inches

10

decimeters = 1 meter (M.)...........................

40

inches

B. Apothecaries

Weight {Troy Weight)

Approximate Equivalent

1

grain (gr.)..........................................

0.065

gm.

10

grains ..................................................................................................

0.7

gm.

20

grains = 1 scruple (Э) ........................................................................

1.3

gm.

3

scruples = 1 dram (3) ......................................................................

4.0

gm.

8

drams = 1 ounceWeights And Measures 1 ....................................

30.0

gm.

12

ounces = 1 pound (fb).....................................................................

372.O

gm.

Volume

1

minimWeights And Measures 2 ...........................................................................

0.06

c.c.

60

minims = 1 dram (3)...............................

4.0

c.c.

8

drams = 1 ounceWeights And Measures 3 ...............................

30.0

c.c

16

ounces = 1 pint (O) ..........................................................................

475.0

c.c.

2

pints = 1 quart (Oij) ..........................................................................

950.0

c.c.

8

pints = 1 gallon (Cong.). (1 gill = 4 fluidounces.)

Length 1 inch (in.).......................................... 2.5 cm.

Noteworthy Terms

1

ounce avoirdupois .............................................................................

437.5

grains

1

ounce troy ..........................................................................................

480.0

grains

1

fluidounce of water (the standard of volume) ..................................

455.7

grains

1

pound avoirdupois is ......................................................................

7000.0

grains

1

pound troy is ..................................................................................

5760.0

grains

1 minim of water weighs 455.5/480 grains = 0.95 grain = 61.61 mg.

15 grains of water =16 minims; one grain of water measures

1.05 minims = 0.0648 c.c. An imperial pint is 20 ounces; a United States pint is 16 ounces.

Exact Equivalents Of Metric And Apothecaries' Weights And Measures According To The U. S. Pharmacopoeia

Volume

1

c.c .....................................................................................................

16.23

minims

1

liter (1000 c.c.) ..................................................................................

33.8

oz.

1

minimWeights And Measures 4 .......................................................................

0.061

c.c.

1

fluidram (3) ........................................................................................

3.696

c.c.

1

fluidounceWeights And Measures 5 .....................................

29.57

c.c.

1

pint (O)...........................................

473.18

c.c.

Weight

1

milligram, 0.001 (mg) .......................................................................

0.0154

grain

1

centigram, 0.01 (eg.).................................

0.1543

grain

1

decigram, 0.1 (dg.)..................................

1.543

grains

1

gram, 1.0 (gm.).....................................

15.4324

grains

30

grams, 30.0.........................................

462.9

grains

31

grams.............................................

478.4

grains

1

grain (gr.)..........................................

0.065

gm.

10

grains ...................................................................................................

0.648

gm.

15

grams.............................................

0.972

gm.

1

scruple.............................................

1.296

gm.

1

dram (3)..........................................

3.89

gm.

1

ounce troyWeights And Measures 6 .....................................

31.1

gm.

1

ounce avoirdupois...................................

28.35

gm.