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ICSE Class 9 Answered

I didn’t got the kinds of unit topic so please can you explain it in easy way and also please can you give me some examples of both kinds also please 
Asked by aaryanmundhe68.9spicertl | 13 May, 2020, 08:40: PM
answered-by-expert Expert Answer
In physics units refers to the the standard by which we can measure the physical quantities.
 
There are two kinds of units: - 
 
1. Fundamental units or basic unit 
2. Derived units 
 
Fundamental or basic unit: A fundamental unit is that which is independent of any other unit or which can neither be changed nor be related to any other fundamental unit. 
examples: - length, mass, etc. 

 The seven fundamental quantities and their units are as follows : - 
 
Fundamental quantity   Unit
Time Second
Length  metre
Mass kilogram
Electric current Ampere
Temperature Kelvin
Amount of substance  mol
Intensity Candela
 
 
 
 
 
 
 
 
 
 
 
 
 
Derived units: - Units which depend on the fundamental units or which can be expressed in terms of the fundamental units are called derived units. 

 
Examples of derrived units are as follows: - 
 
 
If you will see the table above you can see that the unit of these derived quantities are obtained from fundamental units. 
For example: -
Area has unit m2 which is obtained from unit of fundamental quantity i.e. length whose fundamental unit is metre (m). 

Answered by Shiwani Sawant | 14 May, 2020, 11:55: AM

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