<https://blog.truegeometry.com/engineering/Analytics_Impact_of_Fluid_Density_on_Reynolds_Number_D_v_.html>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://blog.truegeometry.com/engineering/Analytics_Impact_of_Fluid_Density_on_Reynolds_Number_D_v_.html>