On Wednesday 15 July 2009 09:29:59 John M. Steele wrote: > Engineers need to know they need pure base units for calculation, but they > already know this. In everyday life, few people do such calculations. > Mostly, they want an estimate of how long it will take to get somewhere. > While they could probably convert the kilometers to meters, they frankly > don't want the answer in seconds (except possibly in a race).
Or when computing how fast one can stop, but that requires solving a quadratic equation, which is not something one can do when an accident occurs in front of him! Pierre