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Units and Conversions

# Units and Conversions - General Tables of Units of...

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General Tables of Units of Measurement C-1 Appendix C General Tables of Units of Measurement These tables have been prepared for the benefit of those requiring tables of units for occasional ready reference. In Section 4 of this Appendix, the tables are carried out to a large number of decimal places and exact values are indicated by underlining. In most of the other tables, only a limited number of decimal places are given, therefore making the tables better adopted to the average user. 1. TABLES OF METRIC UNITS OF MEASUREMENT In the metric system of measurement, designations of multiples and subdivisions of any unit may be arrived at by combining with the name of the unit the prefixes deka , hecto , and kilo meaning, respectively, 10, 100, and 1 000, and deci , centi , and milli , meaning, respectively, one-tenth, one-hundredth, and one- thousandth. In some of the following metric tables, some such multiples and subdivisions have not been included for the reason that these have little, if any currency in actual usage. In certain cases, particularly in scientific usage, it becomes convenient to provide for multiples larger than 1 000 and for subdivisions smaller than one-thousandth. Accordingly, the following prefixes have been introduced and these are now generally recognized: yotta, (Y) meaning 10 deci, (d), meaning 10 24 -1 zetta, (Z), meaning 10 centi, (c), meaning 10 21 -2 exa, (E), meaning 10 milli, (m), meaning 10 18 -3 peta, (P), meaning 10 micro, (μ), meaning 10 15 -6 tera, (T), meaning 10 nano, (n), meaning 10 12 -9 giga, (G), meaning 10 pico, (p), meaning 10 9 -12 mega, (M), meaning 10 femto, (f), meaning 10 6 -15 kilo, (k), meaning 10 atto, (a), meaning 10 3 -18 hecto, (h), meaning 10 zepto, (z), meaning 10 2 -21 deka, (da), meaning 10 yocto, (y), meaning 10 1 -24 Thus a kilometer is 1000 meters and a millimeter is 0.001 meter. Units of Length 10 millimeters (mm) = 1 centimeter (cm) 10 centimeters = 1 decimeter (dm) = 100 millimeters 10 decimeters = 1 meter (m) = 1000 millimeters 10 meters = 1 dekameter (dam) 10 dekameters = 1 hectometer (hm) = 100 meters 10 hectometers = 1 kilometer (km) = 1000 meters

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General Tables of Units of Measurement By action of the 12th General Conference on Weights and Measures (1964) the liter is a special name for the cubic 1 decimeter. C-2 Units of Area 100 square millimeters (mm ) = 1 square centimeter (cm ) 2 2 100 square centimeters = 1 square decimeter (dm ) 2 100 square decimeters = 1 square meter (m ) 2 100 square meters = 1 square dekameter (dam ) = 1 are 2 100 square dekameters = 1 square hectometer (hm ) = 1 hectare (ha) 2 100 square hectometers = 1 square kilometer (km ) 2 Units of Liquid Volume 10 milliliters (mL) = 1 centiliter (cL) 10 centiliters = 1 deciliter (dL) = 100 milliliters 10 deciliters = 1 liter = 1000 milliliters 1 10 liters = 1 dekaliter (daL) 10 dekaliters = 1 hectoliter (hL) = 100 liters 10 hectoliters = 1 kiloliter (kL) = 1000 liters Units of Volume 1000 cubic millimeters (mm ) = 1 cubic centimeter (cm ) 3 3 1000 cubic centimeters = 1 cubic decimeter (dm ) 3 = 1 000 000 cubic millimeters 1000 cubic decimeters = 1 cubic meter (m ) 3 = 1 000 000 cubic centimeters = 1 000 000 000 cubic millimeters Units of Mass 10 milligrams (mg) = 1 centigram (cg) 10 centigrams = 1 decigram (dg) = 100 milligrams 10 decigrams = 1 gram (g) = 1000 milligrams 10 grams = 1 dekagram (dag)
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