A coherent system of units is a system of units of measurement used to express physical quantities, that does not use conversion factors in the definitions of its derived units.
James Clerk Maxwell played a major role in developing the concept of a coherent CGS system and in extending the metric system to include electrical units.
Oldest preserved measuring rod, dating to 2650 BC, excavated at Nippur, Mesopotamia, on display in the Archaeology Museum of Istanbul, Turkey. The rod shows the various units of measure in use.
Dimensional analysis
Videos
In engineering and science, dimensional analysis of different physical quantities is the analysis of their physical dimension or quantity dimension, defined as a mathematical expression identifying th
Dimensional analysis and numerical experiments for a rotating disc