UNITS OF MEASUREMENT

 PHYSICS PART-2 (UNITS OF MEASUREMENT)

There are two types of Units:

1) Fundamental Units

Fundamental Units are those units which are independent to each other. Initially there were three Fundamental Units :- Units of Length, Mass, and Time.
But later, four more units were added as Fundamental Units:- Electric Current, Temperature, Luminous intensity and Amount of Substance.
Presently there are seven fundamental units.

2) Derived Units

Such a unit which is derived or made from two or more Fundamental Units known as Derived Units.
These units have no existence as independent like fundamental units.
For Example : the unit of Force, momentum, work, potential energy, density etc.

Different System of Units

1) CGS System :

C – Centimeter
G- Gram
S- Second
In this system of units Length, Mass and Time are measured in Centimeter, Gram and Second respectively.
Example -  dyne is the CGS unit of Force
CGS System also known as Metric or French System of Units.

2) FPS System:

F- Foot
P- Pound
S- Second
In this system of units Length, Mass and Time are measured in Foot, Pound and Second respectively.
Also known as British System of Units

3) MKS System:

M- Meter
K- Kilogram
S- Second
In this system of units Length, Mass and Time are measured in Meter, Kilogram and Second respectively.

4) SI System:

SI stands for International System of Unit.
SI Unit of system is extended form of the MKS system
Its is a scientific method of expressing the quantities of important natural phenomena. There are seven base units in the system, from which other units are derived.
Metre for measurement of length, the kilogram for mass, the second for time, the ampere for electric current, the kelvin for temperature, the candela for luminous intensity, and the mole for amount of substance.

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