Sunday, July 15, 2012

Fundamental Quantities

Something can be measure and expressed by a value is called quantity, and generally it a unit.

A quantity use in science and tecnologi is a call a phisicall quantity.
Examples of physical quantities length, weight and time.


Ekample :
1.What quantity is being measure by this boy ?


2.What quantity is being measure by this man?


3.What quantity is being measure by this woman ?

4.What quantity is being measure by this man ?


The seven of fundamental unit of the International System
Fundamental Quantitiesunitabbreviationdimension
Length
meter
m
L
Mass
kilogram
kg
M
Time
second
s
T
Temperature
kelvin
K
θ
Amount of substance
mol
mol
N
Luminous intensity
candela
cd
J
Electric current
ampere
A
I


Very large or very small numbers are difficult to express such as the earth’s radius or time between collisions in SI units.
So to make it simple, we use a prefix.
prefix
abbreviatin
factor
exa
E
1018
peta
P
1016
tera
T
1012
giga
G
109
mega
M
106
kilo
k
103
hekto
h
102
deka
da
10

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