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ICSE Class 9 Answered

I didn't get how to choose units.Pls eloborate it with some examples
Asked by muskaanabdullah71.9spicertl | 13 May, 2020, 04:49: PM
answered-by-expert Expert Answer
Below you can find explanation for types of units: - 
In physics units refers to the the standard by which we can measure the physical quantities.
 
There are two types of unit fundamental and derived units. 

The units which can neither be derived from other units nor they can be further resolved into simpler units are called fundamental units.
 
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 are those which depend on the fundamental units or which can be expressed in terms of the fundamental units. 

  Example: speed, velocity, acceleration etc. 
 

Other examples of derived units are as follows: - 

 
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