Do you know your Basics?-X
Classical Mechanics
Level
1
Which of the physical quantities does not have a unit?
Moment of Inertia
Speed
Momentum
Relative Density
Velocity
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Relative density is simply the ratio of density of any material to the density of pure water at 4 degree Celsius.
Since it is the ratio of same physical quantities,therefore both units cancel out each other leaving behind RELATIVE DENSITY to be a pure number or rather I should say a unit less physical quantity.