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# Define physical quantities? What are its types?

## PHYSICAL QUANTITIES:

“All the quantities which can be measured and described by a number are called physical quantities”.

### For Example:

Such as length, time, mass, volume, acceleration, temperature, etc.

### Explanation:

A physical quantity always contains at least two characteristics in common.

1. One is its numerical magnitude.
2. 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 :

### Base Quantities:

“The Base quantities are the type of quantities based on which other quantities are expressed”.

### Explanation:

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.

## Derived Quantities:

“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.

### Explanation:

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

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