Units & measurements Units plays an important roll in physics. For example :- Your friend give a task to measure the length of the wire Ans:- The length of this wire is 10 meters Here 10 represents the length & meters the Units or dimension . Lets goo to deep Fundamental quantities. The physical quantities which are independent of other quantities are called fundamental quantities Example:- mass, length, temperature, etc., Derived quantities. The physical quantities which are derived from fundamental quantities are called Derived quantities Example:- area, velocity, viscosity, pressure, Force constant, etc., The SI unit of the system of units. In 1971,General conference of weights and measures introduced a logical and rationalized system of units known as international system of units,...