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M 10⁻⁶ micro μ 10⁹ giga G 10⁻⁹ nano n 10¹² tera T 10⁻¹² pico P 10¹⁵ peta P 10⁻¹⁵ femto f 10¹⁸ exa E 10⁻¹⁸ atto a

METRIC UNITS OF MEASUREMENT

      The metric system was first proposed in 1791. The French Revolutionary Assembly adopted it in 1795, and the first metric standards (a standard meter bar and kilogram bar) were adopted in 1799.

7. Units of Length

Name	Symbol	Value
millimeter	mm	1 mm = 0.001 m
centimeter	cm	1 cm = 10 mm
decimeter	dm	1 dm = 10 cm
meter	m	1 m = 10 dm = 1000 mm
dekameter	dam	1 dam = 10 m
hectometer	hm	1 hm = 10 dam
kilometer	km	1 km = 10 hm = 1000 m

8. Units of Area

Name	Symbol	Value
sq. millimeter	mm2	1 mm2 = 0.000001 m2
sq. centimeter	cm2	1 cm2 = 100 mm2
sq. decimeter	dm2	1 dm2 = 100 cm2
sq. meter	m2	1 m2 = 100 dm2
sq. decameter	dam2	1 dam2 = 100 m2
sq. hectometer	hm2	1 hm2 = 100 dam2
sq. kilometer	km2	1 km2 = 100 hm2

9. Units of Liquid Value

Name	Symbol	Value
milliliter	mL	1 mL = 0.001 L
centiliter	cL	1 cL = 10 mL
deciliter	dL	1 dL = 10 cL
liter	L	1 L = 10 dL = 1000 mL
dekaliter	daL	1 daL = 10 L
hectoliter	hL	1 hL = 10 daL
kiloliter	kL	1 kL = 10 hL = 1000 L

10. Units of Volume

Name	Symbol	Value
cu. millimeter	mm3	1 mm3 = 10 −9 m3
cu. centimeter	cm3	1 cm3 = 1000 mm3
cu. decimeter	dm3	1 dm3 = 1000 cm3
cu. meter	m3	1 m3 = 1000 dm3

11. Units of Mass

Name	Symbol	Value
milligram	mg	1 mg = 0.001 g
centigram	cg	1 cg = 10 mg
decigram	dg	1 dg = 10 cg
gram	g	1 g = 10 dg
dekagram	dag	1 dag = 10 g
hectogram	hg	1 hg = 10 dag
kilogram	kg	1 kg = 10 hg = 1000 g
megagram	Mg	1 Mg = 1000 kg = 1 t

U.S. UNITS OF MEASUREMENT

      Most of the U.S. system of measurements is the same as that forthe U.K. The biggest differences to be noted are

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