10-centimeter rule.
The upper edge is in millimeters, the lower in centimeters and half centimeters.
| Units. | The most commonly used divisions and multiples. | |
|---|---|---|
| The Meter, for Length |  | Centimeter (cm), 1/100 meter; |
| Millimeter (mm), 1/1000 meter; | ||
| Micron (μ), 1/1000 millimeter. | ||
| The micron is the unit in micrometry. | ||
| Kilometer, 1000 meters; | ||
| used in measuring roads and other long distances. | ||
| The Gram, for Weight |  | Milligram (mg), 1/1000 gram. |
| Kilogram, 1000 grams, | ||
| used for ordinary masses, like groceries, etc. | ||
| The Liter, for Capacity | | Cubic Centimeter (cc), 1/1000 liter. |
| This is more common than the correct form, | ||
| Milliliter. | ||
| Divisions of the units are indicated by Latin prefixes: | ||
| deci, 1/10; centi, 1/100; milli, 1/1000. | ||
| Multiples are designated by Greek prefixes: | ||
| deka, 10 times; hecto, 100 times; kilo, 1000 times; myria, 10,000 times. | ||
TABLE OF METRIC AND ENGLISH MEASURES.
| Meter | = 100 centimeters, 1000 millimeters, 1,000,000 microns, 39.3704 inches. | |
| Millimeter (mm) | = 1000 microns, 1/10 millimeter, 1/1000 meter, 1/25 inch, approximately. | |
| Micron (μ) | = 1/1000 mm, 1/1000000 meter (0.000039 inch), 1/25000 inch, approximately. | |
| (unit of measure in | ||
| micrometry) | ||
| Inch (in.) | = 25.399772 mm (25.4 mm, approx.). | |
| Liter | = 1000 milliliters or 1000 cubic centimeters, 1 quart (approx.). | |
| Cubic centimeter (cc or cctm) | = 1/1000 liter. | |
| Fluid ounce (8 fluidrachms) | = 29.578 cc (30 cc, approx.). | |
| Gram | = 15.432 grains. | |
| Kilogram (kilo) | = 2.204 avoirdupois pounds (2⅕ pounds, approx.). | |
| Ounce Avoirdupois | = 28.349 grams | (30 grams, approx.). |
| (437½ grains) | ||
| Ounce Troy or Apothecaries’ | = 31.103 grams | |
| (480 grains) | ||
TEMPERATURE.
To change Centigrade to Fahrenheit: (C. × ⁹/₅) + 32 = F. For example, to find the equivalent of 10° Centigrade,
C. = 10°, (10° × ⁹/₅) + 32 = 50° F.
To change Fahrenheit to Centigrade: (F. - 32°) × ⁵/₉ = C. For example, to reduce 50° Fahrenheit to Centigrade,
F. = 50°, and (50° - 32°) × ⁵/₉ = 10° C.;