Abstract
Before we embark on this introductory study of various theories and concepts about atoms and molecules, it is necessary to lay some groundwork concerning units of measurement of physical quantities. In particular, we are very interested here in the units of mass and energy. The units of mass are simple; chemists and, in fact, most scientists use the metric gram—or more correctly, as we see in a moment—the kilogram. With energy the common units are more varied among scientists and thus the student must take special care to avoid confusion. One of the best ways to avoid confusion in any unit is to define a consistent and standardized set of units. This was devised and internationally accepted in 1960; the set is known as Système International d’Unités, or simply SI units.
Published Version
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