define unit of a physical quantity?
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A Physical Quantity is defined as a measurable quantity in terms of which the general laws of Physics can be described...
A Unit is defined as an internationally accepted, arbitrarily chosen, basic reference standard of a physical quantity, which is of the same nature as is the quantity being measured...
The Dimensions of a physical quantity are defined as the exponents or the indices to which the fundamental or the base quantities are raised in order to represent that particular quantity...
Measurement is defined as the process of determining how large or small a physical quantity is, as compared to an arbitrarily chosen basic reference standard, id est, a unit...
The Base or the Fundamental Units are defined as the units corresponding to Physical quantities known as the fundamental or the base quantities, which are assumed to be mathematically independent of other physical quantities...
The SI, or le Système Internationale d' Unités is defined as "An internationally accepted and universally used system of units, with a standard scheme of units, symbols, and abbreviations, which is a rational, coherent, consistent, and the most convenient system in most of the scientific, technical, industrial, and commercial works, in all branches of Science..."
A Hypothesis is defined as a proposed theory in favour of an observation, in the absence of any in-depth knowledge of the content, mainly based on assumptions. It is a part of the initial stage of scientific methods...
A Model is defined as a proposed theory explaining an observed phenomenon, in the presence of greater or adequate knowledge and logical reasoning...
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