Chemistry - the Complete Course Series, teaches students quantitative reasoning to solve chemistry problems. The 30 volume series covers all aspects of Chemistry from density to the mole, to molarity, stoichiometry and equilibrium. It demonstrates how to ask meaningful questions and conduct careful investigations to build knowledge of chemical and physical concepts and develop the skills to solve mathematical and scientific problems. The metric system of measurement has a long historical background, and grew out of a need for standard and reproducible measurements for both science and commerce. The metric system has at least two distinct advantages over the English system of measurement. In 1960, the modern SI system of measurement was established. This volume teaches seven base units are required and all other scientific units can be derived from combinations of these seven base units. That conversions between metric units can be easily accomplished by either moving a decimal point or multiplying by some power of ten.