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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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