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SI unit of Angle is radian and it is dimensionless quantity. Add response
There is no physical quantity, which has dimension but no unit. Because if a physical quantity has a dimension then it definitely has a unit.
It is easier to use a unit like kilos when we are measuring smaller masses. But when we are calculating larger masses, it becomes more difficult to express something like 2000 Kilos, but it is much easier to say that the weight is 2 Metric tonne. (As 1 Metric tonne =1000 kg)
Scientist Giovanni Giorgi introduced the MKS System. He was an Italian physicist. Later M.K.S system was known as S.I system