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# Definition of: metric system

A decimal system of weights and measures having as fundamental units the gram and the meter. From the gram are derived measures of weight, and from the meter measures of length; measures of surface are based on the square meter and measures of capacity on the liter. The table shown above gives the basic and derived units of the metric system, together with abbreviations and a list of equivalent values in customary U. S. standards; originating in a report to the French Academy (1791) it was legalized in France, Nov. 2, 1801; now universally used in scientific measurement.

 LENGTH EQUIVALENTS WEIGHT OR MASS EQUIVALENTS CAPACITY EQUIVALENTS METRIC U.S. METRIC U.S. METRIC U. S. millimeter (mm) .001 m .03937 in. milligram (mg) .001 g .0154 gr. milliliter (ml) .001 l .033 fl. oz. centimeter (cm) .01 m .3937 in. centigram (cg) .01 g .1543 gr. centiliter (cl) .01 l .338 fl. oz. decimeter (dm) .1 m 3.937 in. decigram (dg) .1 g 1.543 gr. deciliter (dl) .1 l 3.38 fl. oz. METER (m) 1 m 39.37 in. GRAM (g) 1 g 15.43 gr. LITER (l) 1 l 1.056 li. qts. dekameter (dkm) 10 m 10.93 yds. dekagram (dkg) 10 g .3527 oz. av. dekaliter (dkl) 10 l .283 bu. hectometer (hm) 100 m 328.08 ft. hectogram (hg) 100 g 3.527 oz. av. hectoliter (hl) 100 l 2.837 bu. kilometer (km) 1000 m .6213 mi. kilogram (kg) 1000 g 2.2 lbs. av. kiloliter (kl) 1000 l 264.18 gal.
 AREA EQUIVALENTS VOLUME EQUIVALENTS Other prefixes occasionally used are: MICRO—one millionth; MYRIA—10,000 times; MEGA—1,000,000 times METRIC U. S. METRIC U. S. sq. millimeter (mm2) .000001 ca .00155 sq. in. cu. millimeter (mm3) .001 cm3 .016 minim sq. centimeter (cm2) .0001 ca .155 sq. in. cu.centimeter (cc, cm3) .001 dm3 .061 cu. in. sq. decimeter (dm2) .01 ca 15.5 sq. in. cu. decimeter (dm3) .001 m3 61.023 cu. in. CENTARE (ca, m2) 1 m2 10.76 sq. ft. STERE (s, m3) 1 m3 1.307 cu. yds. sq. dekameter (dkm2) 100 ca .0247 acre cu. dekameter (dkm3) 1000 m3 1307.942 cu. yds. Also are (a) 2.47 acres cu. hectometer (hm3) 1,000,000 m3 1,307,942.8 cu. yds. sq. hectometer (hm2) 10,000 ca .386 sq. mi. cu. kilometer (km3) 1,000,000,000 m3 0.24 cu. mile Also hectare (ha) sq. kilometer (km2) 1,000,000 ca

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