“All the quantities which can be measured and described by a number are called physical quantities”.
Such as length, time, mass, volume, acceleration, temperature, etc.
A physical quantity always contains at least two characteristics in common.
- One is its numerical magnitude.
- Another is the unit in which it is measured.
Example # 1:
If the length of the plant is 50 cm then 50 is its numerical magnitude and centimeter is the unit of measurement.
Example # 2 :
Similarly when a shopkeeper says that each bag contains 20kg of flour.He is describing its numerical magnitude ( which is 20) as well as the unit of measurement ( which is kg ). It would be meaningless to state 20 or kg separately.
TYPES OF PHYSICAL QUANTITIES:
Physical quantities are divided into two types, their names, and definitions are given below :
“The Base quantities are the type of quantities based on which other quantities are expressed”.
There are seven physical quantities. They form the foundation for other physical quantities. Those base quantities combined
with one another and form derived quantities.
FOR EXAMPLE :
Length, mass, time, electric current, temperature, the intensity of light, and the amount of a substance are examples of base quantities.
BASE QUANTITIES TABLE
“The Derived Quantities are the type quantities which are formed by the combination of two or more than two base quantities are called derived quantities.
The physical quantities which are expressed in terms of base quantities are called the derived quantities. They are formed by the combination of two or more than two base quantities.
FOR EXAMPLE :
Area, volume, speed, force, work, energy, power, electric charge, electric potential, etc are examples of derived quantities.
DERIVED QUANTITIES TABLE