PHYSICAL QUANTITIES

   PHYSICAL QUANTITIES:

All measurable and observable quantities are called physical quantities

TYPES:

Physical quantities are devided into two types
1-Base quantities
2-Derived quantities

BASE QUANTITIES:

The minimium number of those physical quantities in term of which other physical quantities can be described

DERIVED QUANTITIES:

Physical quantities whose definitions are based on other physical quantities are called derived quantities
        MEASUREMENT IS THE BACKBONE OF PHYSIC WITHOUT MEASURMENT THERE IS NO CONCEPT OF PHYSIC

UNIT SYSTEM:

Unit system is the combination of units (standard amount of physical quantities) in which some of the quantities are selected as base quantities  and all other quantities are derived from the base quantities
NAMES OF DIFFERENT SYSTEM:
1-CGS system(centimeeter,gram,second)system
2-FPS system(foot,pound,second)system
3-MKS system (meter,kilogram,second)
4-SI UNITS (system of international units)

INTERNATIONAL SYSTEM OF UNIT:

In 1960, an international committee agreed on set of definitions and standard to describe the physical quantities. The system that was established is called the system international(SI).
the system international formed from three kinds of units;
1-BASE UNIT
2-DERIVED UNIT
3-SUPPLEMENTARY UNITS
BASE UNIT:
There are seven base units for different physical quantities