# System International Units

 SI units SI Abbreviations Other Abbreviations length meter m volume liter L l mass kilogram kg kgm time second s sec temperature kelvin K °K

# Other Metric Units

 1 micron (m ) = 1 micrometer (mm) = 10 –6 meter                  mm                           m 1 angstrom (Å or A) = 10 –10 meter = 10-8 cm                      0.1nm                       Å

# Prefixes for Use with Basic Units of Metric System

Prefix

Symbol

### Power

Equivalent

Yotta

Y

1024

=

1,000,000,000,000,000,000,000,000

Zetta

Z

1021

=

1,000,000,000,000,000,000,000

Exa

E

1018

=

1,000,000,000,000,000,000

Peta

P

1015

=

1,000,000,000,000,000

Tera

T

1012

=

1,000,000,000,000

Trillion

Giga

G

109

=

1,000,000,000

Billion

Mega

M

106

=

1,000,000

Million

Kilo

k

103

=

1,000

Thousand

Hecto

h

102

=

100

Hundred

Deca

da

101

=

10

Ten

¾

¾

100

=

1

One

Deci

d

10-1

=

0.1

Tenth

Centi

c

10-2

=

0.01

Hundredth

Milli

m

10-3

=

0.001

Thousandth

Micro

m

10-6

=

0.000001

Millionth

Nano

n

10-9

=

0.000000001

Billionth

Pico

p

10-12

=

0.000000000001

Trillionth

Femto

f

10-15

=

0.000000000000001

Atto

a

10-18

=

0.000000000000000001

Zepto

z

10-21

=

0.000000000000000000001

Yocto

y

10-24

=

0.000000000000000000000001

Examples:

1000 meters = 1 kilometer = 1km

106 hertz = 1 megahertz = 1 MHz

10-3 sec = 1 millisecond = 1 msec

# Conversion Factors

 1 erg = 10-7 joule = 10-7 kg · m2/s2 1 joule = 6.2419 x 1018 eV 1 in = 25.4 mm = 2.54 cm 1 yd = 0.9144 m 1 mi = 1.6093 km » 8/5 km 1 oz = 28.3 g 1 lb = 0.4536 kg

# Binary Prefixes

 kibi 210 = 1,024 mebi 220 = 1,048,576 gibi 230 = 1.0737 x 109