units and measurement

1. A. ANTONY SANTHAN RAJ

2.  The quantities which cannot be expressed in
terms of any other physical quantity is called
fundamental quantity.
 Example:
Length
Mass
Time

3. QUANTITY UNIT SYMBOL
LENGTH METRE m
MASS KILOGRAM Kg
TIME SECOND S
ELECTRIC CURRENT AMPER A

4.  Quantities that can be expressed in terms of
fundamental quantities is called derived
quantity.
 Example:
Area
Volume
Density

5. QUANTITY UNIT SYMBOL
Area of the square Metre²
or
Square metre
m²
Volume of the cube Metre³
or
Cubic metre
m³
Density Kilogram Metre³ Kgm³
Force Newton N