We just found UnitConversion.org, an online unit converter with auto-complete and a pretty large database of odd units. It looks like a a great tool, although it is inexplicably lacking the Debye (which we were trying to convert to electron Angstroms).
My favorite scientific unit has always been the barn (1 barn = 10-24 cm2), which is a unit of cross-sectional area. I.e. hitting this nucleus should be as easy as hitting the side of a barn… Quadrupole moments can be expressed as electron-barns, and our group code uses this unit internally just because it amuses us.
It is interesting to note the following conversions:
- 1 barn = 1.072505996 x 10-36 township
- 1 barn = 1.544408634 x 10-34 homestead
- 1 barn = 2.471053815 x 10-32 acre
Apparently, physicists have very small farms.