Measurement Systems

 

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 ( or A) = 10 10 meter = 10-8 cm 0.1nm

 

 

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

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