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What are fundamental and derived units? Fundamental and derived units - (i) Fundamental units are those which are independent of each other and cannot be further resolved into any other units. All other units can be expressed in terms of these fundamental units. The quantities mass, length and time are called fundamental quantities. For measuring these quantities, these are independent units such as kilogram, meter and second. Fundamental and derived units (ii) For measuring other physical quantities , if a separate unit is defined for each of them, then it will become quite difficult to remember all of them because their number will be quite high. It is found that units of other physical quantities can be expressed in therms of the fundamental units of mass, length and time. The units of all such physical quantities which can be expressed in therms of the fundamental units of mass, length and time are called derived units. (iii) For example, the unit of area...