ICSE Class 9 Answered
what is si
Asked by shibammondal491 | 07 May, 2021, 17:42: PM
I guess you are referring SI units system .
SI units sytem is called International standard units system .
In this units sytem, units of physical quantities are expressed in terms of fundamental units .
In this units system , 7 quantities are considered as fundamental quantities .
These fundamental quantities and units of respective fundamenetal quantities are given below.
Quantity | Units |
Length | metre , m |
mass | kilogram, kg |
time | second, s |
Current | Current , A |
Temperature | Kelvin, K |
Amount of Substance | mole |
Luminous intensity | Candela, Cd |
Above units of fundamental quantities are called fundamental units.
Other physical quantities are called derived quantities and their units are called derived units
Example :-
area = length × length , units m2
density = mass/volume , units kg/m3
speed = distance / time , units m/s
Answered by Thiyagarajan K | 07 May, 2021, 18:44: PM
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