Get more lessons like this at http://www.MathTutorDVD.com Here we discuss fundamental concepts in chemistry and physics that involve units and unit conversion. We introduce the concept of a conversion factor for units, the metric system prefixes, and how to use scientific notation.. Learn Unit Conversions, Metric System & Scientific Notation in Chemistry & Physics Unit Conversions, Metric System & Scientific Notation How to Convert Units in Chemistry & Physics Unit Conversions & the Metric System: A Clear Guide Mastering Unit Conversions in Chemistry & Physics