mHz
millihertz
Frequencyexact by definition
The millihertz is 10⁻³ hertz, one cycle every 1,000 seconds. It is the band of Earth's free oscillations after a great earthquake, of ocean tides expressed as frequencies, and of the space-based gravitational wave detectors designed to observe massive binaries.
Watch out: Its symbol mHz differs from megahertz MHz only in case, and the two are nine orders of magnitude apart. This is the single most damaging case-sensitivity trap in the SI prefixes, and the reason the unit id here is "millihz" rather than "mhz".
| 1 mHz | 0.001 Hz |
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