This is the first of two videos about unit conversion problems. This style of problem solving is also called "dimensional analysis." This video shows you how you can use a conversion factor to change units. Our second video will have examples of using multiple conversion factors. Both videos have example problems. We study unit conversion and dimensional analysis in chemistry class, because it is so useful in solving chemistry problems. But you'll find it helpful in math, physics, engineering...so many different subjects. This video should especially help those new to the metric system and metric conversions - see example 3.