In a generator mechanism, the conductor in question is typically a coil (or set of coils) made
of copper wire. However, there is no reason the conductor must be made of copper wire. Any
electrically conductive substance in motion is sufficient to electromagnetically induce a voltage, even
if that substance is a liquid38. Therefore, electromagnetic induction is a technique applicable to the
measurement of liquid flow rates.
Consider water flowing through a pipe, with a magnetic field passing perpendicularly through
the pipe