Objective of the Bi-Weekly Comments on SI

The International System of Units (SI) is the modern metric system that enables us to describe the magnitudes of physical quantities such as length, area, speed, pressure, temperature, and so forth.

The use of SI units goes far beyond their given names and scientific definitions. For example, most formulas and equations used in physics, in engineering, and in everyday affairs require a knowledge of SI units.

The main purpose of my Bi-Weekly Comments on SI is to present information on the application and use of SI in small, user-friendly doses.

A second purpose is to introduce the Wildi SI Charts as a visual source of information about units in general, with emphasis on SI.

Because information on SI is provided in a user-friendly way, it will appeal not only to teachers, instructors and students, but also to newcomers to this modern metric system.

The Bi-Weekly Comments on SI appear every second week. Only the three most recent Comments are displayed. You can obtain prior Comments by sending your request to  contact me.

Theodore Wildi is a Senior Member of the Institute of Electrical and Electronic Engineers (IEEE) and a member of the American Society of Engineering Education (ASEE) and the US Metric Association (USMA). In Canada, he served for many years as Chair of the CSA Technical Committee on the International System of Units, as well as Chair of the CAC/ISO/TC12 Committee on Quantities, Units and Conversion Factors. In the United States, he is a member of the IEEE Standards Coordinating Committee (SCC14) on Quantities, Units and Letter Symbols.