Everything flows, but only the macromolecules are worth the time.
Tuesday, October 05, 2010
On Units of Measure
Unit reduction is very commonly done. For instance, thermal conductivity is the heat flow per unit area divided by the temperature gradient. (W/m2)/(K/m) which reduces to W/(m K). So how come gas mileage figures aren't reduced to inverse area? Miles per gallon is a length over a volume which is an inverse area. 1 mpg is equal to almost 39,500 ft-2, so just multiply that appropriately. Anyone have the gall to start using this? (Not me! I was just thinking about on the drive in today.)