1.2. SI SYSTEM OF BASIC UNITS USED IN THIS TEXT AND OTHER SYSTEMS
There are three main systems of basic units employed at present in engineering and science. The first and most important of these is the SI (Système International d'Unités) system, which has as its three basic units the meter (m), the kilogram (kg), and the second (s). The others are the English foot (ft)–pound (lb)–second (s), or English system and the centimeter (cm)–gram (g)–second (s), or cgs system.
At present the SI system has been adopted officially for use exclusively in engineering and science, but the older English and cgs systems will still be used for some time. Much of the physical and chemical data and empirical equations are given in these latter two systems. Hence, ...
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