Okay, here&#39;s what we need to get at, for starters. And maybe an illustration or three and a little exchange will go a long way towards helping my better comprehend units.<br><br>I&#39;m starting with a set of SI calculations for oil and gas constants calculations. Eventually we will need to accommodate US units as well. But not quite yet.<br>
<br>We need to get at a calculation involving Pressure Gradient, which ends up being metric::bar/si::meter (bars over meters) in specific units, or I suppose si::pressure/si::length might also work.<br><br>Then we need to get after Fluid Density, which ends up being si::kilogram/si:meter^3 (kilograms over cubic meters) in specific units, or I suppose si::mass/si::meter^3 (I don&#39;t know what this looks like in terms of boost::units, maybe one of the volumes?), or perhaps make use of mass_density?<br>
<br>We take all that and divide Pressure Gradient by Fluid Density to arrive at what we hope will be the the conversion factor: 0.0000981. Which we could specify that as a constant, but I like proving it through the software first (plausibly once) when we ask for it.<br>
<br>Similar type calculations would follow for US units involving gallons, cubic inches, inches, and inches per foot, along these lines.<br><br>So I need some examples will spell it out for me. The learning curve using boost::units is just too steep for me right now without it.<br>
<br>Any tips or pointers along these lines would be much appreciated.<br><br>Thank you,<br><br>Michael<br>