Music of the Spheres: Converting Scientific Units
Bruce Irving, writing on his blog Music of the Spheres (link above) notes: "Orbiter is completely metric, so when I was writing yesterday’s post about force vector visualization, I wanted to mention the conversion from meganewtons (MN) to pounds-force (lbf) for those more familiar with “English units” (i.e., pounds of thrust for rocket engines). There are probably a billion web sites with information on converting units, but I especially like AllConversions.com, because it has a simple format and includes a huge number of units in its drop-down lists."
Let us know your favourite, unit-conversion websites.