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1) " The numbers which are obtained by dividing the inertia force by viscous force or gravity force or pressure force or surface tension force or elastic force are called as Dimensionless Numbers"
2) As this is a ratio of one force to the other force it will be a dimensionless number
3) These Dimensionless Numbers are also called as Non - dimensional parameters
Important Dimensionless Number:
a) Reynold's Number
b) Froude's Number
c) Euler's Number
d) Weber's Number
e) Mach's Number