I am programming a module used to convert measurement units. This will be part of a system that supports complex numbers. I never use complex numbers in my field but of course engineers and physicists do so I thought I should ask a couple of questions first. Q1. Is there anything unusual about converting something like (5 + 2i) meters/sec into miles per hour? I think it is the same process as with plain old real numbers (multiply by ~2.237 in this particular case) but are there conditions specific to complex values and not reals? Q2. Is there any mesurement unit(s) that uses a complex conversion factor instead of just a real ratio? In other words, would the software ever need to indicate a conversion ratio as a complex value instead of just a real?