Numbers usually have some associated dimensions, so when doing dosing calculations it is important to not forget about the associated physical dimensions. Sometimes the dimensions make easy sense: Plasma concentration, for example has the dimension of something like mg/L. Makes sense? Sure. But how about AUC - the famous "area under the curve": mg/L x h Unless you are a numbers and mathematics genius, that dimension makes less sense at first site....
How about speed, say, 80 miles/h? When you see this number and I ask you "How long would it take you to go 80 miles?" - can you easily answer that? If not - here is how a former student of mine deals with this complex task:
http://www.youtube.com/watch?v=Qhm7-LEBznk#
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