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CBSE Class 9 Answered

dimensions meaning
Asked by sukhjeet.singh86n | 25 Oct, 2021, 10:08: AM
answered-by-expert Expert Answer
Physical quantities are classified as fundamental quantities and derived quantities.
 
Fundamental quantities are expressed by itself , whereas derived quantities are expressed in terms of fundmental quantities .
 
For example length , mass , time are fundamental quantities .
 
Dimension of length is symbolised as L . Dimension of mass is symbolised as M and dimension of time is symbolised as S
 
Whereas speed which distance per time is derived quantity because speed is expressed in terms of length and time.
 
Since speed is distance divided by time, speed has dimension of  L/S  or L S-1
 
Density  which is mass per unit volume is derived quantity because density is expresses in terms of mass and  volume
( volume is expressed in terms of lengths )
 
Dimension of density is M L-3
 
Answered by Thiyagarajan K | 25 Oct, 2021, 12:13: PM

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