Question

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difference between fundamental and base units??

Answer 1

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▪Fundamental quantities are those physical quantities that cannot be expressed in terms other quantities. It is an independent quantities. For example: Length, mass, time, temperature, electric current, amount of substance.

▪It is a fundamental unit that is defined arbitrarily and not by combinations of other units. The base units of the SI system are the metre, kilogram, second, ampere, kelvin, mole, and candela.



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Answer 2

Fundamental Quantities

A set of fundamental units are defined in every units system, and the corresponding physical quantities are called the fundamental quantities. Fundamental units are independently defined, and often the quantities are directly measurable in a physical system.

In general, a system of units requires three mechanical units (mass, length, and time). One electrical unit is also required. Even though above set of units may suffice, for convenience few other physical units are considered fundamental. c.g.s (centimeter-gram-second), m.k.s (meter-kilogram second), and f.p.s (feet-pound-second) are formerly used systems with fundamental units.

SI unit system has replaced much of the older units systems. In the SI system of units, by definition, following seven physical quantities are considered as fundamental physical quantities and their units as fundamental physical units. 

Derived Quantities

Derived quantities are formed by product of powers of fundamental units. In other words, these quantities can be derived using fundamental units. These units are not defined independently; they depend on the definition of other units. Quantities attached to derived units are called derived quantities.

For example, consider the vector quantity of speed. By measuring the distance traveled by an object and the time taken, the average speed of the object can be determined. Therefore, speed is a derived quantity. Electric charge is also a derived quantity where it is given by the product of current flow and time taken. Each derived quantity has derived units. Derived quantities can be formed.