## Wednesday, September 7, 2011

### Units of Measure in Physics

Unites of measure are numerical values given physical quantities relative to some standard. The International System of Units (SI) is the system of units of measure used as a global standard by international treaty.

## Seven SI Base Units

meter
distance

kilogram

mass

second

time

ampere

current

kelvin

temperature

mole

amount of substance

candela

intensity of light

There is a list of
SI unit prefixes
that that multiply the values from 1024 and
10-24 below is a partial list.

## SI Prefixes

### decimal

giga-

G
109

billion

1,000,000,000

mega-

M
106

million

1,000,000

Kilo-

k
103

thousand

1,000

Hecto-

h
102

hundred
100

deca-

da
101 ten 10
- - 100 one 1

deci-

d
10-1 tenth

0.1

centi-

c
10-2

hundredth

0.01

milli-

m
10-3

thousandth

0.001

micro-

m
10-6

millionth

0.000,001

nano-

n
10-9

billionth

0.000,000,001
As a result 1,000 meters is a kilometer, a hundredth of a meter is
centimeter and a thousandth of a meter is a millimeter.