Unit fHz
Name femtohertz
Category Frequency
Details Femtohertz (fHz) is a unit of frequency, representing a very small frequency value in the field of science and engineering. It is equal to 10^-15 hertz (Hz), or one quadrillionth of a hertz. In other words, in one femtohertz, there is just one cycle of oscillation or wave per quadrillion (10^15) seconds.

Being such a low frequency, femtohertz is typically used to express extremely slow frequencies or long time scales, such as those found in geological or astronomical processes, rather than in everyday human experiences or engineering applications.