Units and Dimensions

Abstract

This article is about units and dimensions, which is the basic of measurement, so it consists in our everyday life and everday science.

Laws of Physics are in fact relationships between major physical quantities. And the laws of Physics remains same for all observers inertial reference frame. Importance of measurement may be stated from often quoted view of Lord Kelvin.

"I often say that when you can measure what you are speaking about and Express it in numbers you know something about it but when you cannot Express it in numbers your knowledge is a meagre and unsatisfactory kind; it may be the beginning of knowledge but you have scarcely in your thought, advance to the stage of science whatever the matter may be".

All the scientists were not always remained confined only with strictly measurable concept no no denying the great importance of measurement to science. Open in the history of science small but significant discrepancies between the existing theory and accurate measurement have led to the development of the new and more general theories. Does the measurement of velocity of light in various media facilitated to establish the wave theory of light. Special theory of relativity actually a from an attempt to measure the absolute velocity of the Earth and the quantum theory emerge from the measurement of the distribution of energy in the black body spectrum. Sach advances in our understanding would not have been possible is scientists were satisfied with only a qualitative explanation of the natural phenomena.