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 | 0.001 |
One millihertz in every frequency unit
| 1,000,000 | nanohertz (nHz) | |
| 31,557.6 | per year (1/yr) | |
| 1,000 | microhertz (μHz) | |
| 86.4 | per day (1/d) | |
| 3.6 | per hour (1/h) | |
| 1 | millihertz (mHz)this unit | |
| 0.06 | revolution per minute (rpm) | |
| 0.06 | cycle per minute (cpm) | |
| 0.06 | beat per minute (bpm) | |
| 0.001 | hertz (Hz) | |
| 0.001 | cycle per second (cps) | |
| 0.001 | revolution per second (rev/s) | |
| 0.000001 | kilohertz (kHz) | |
| 1.00000e-09 | megahertz (MHz) | |
| 1.00000e-12 | gigahertz (GHz) | |
| 1.00000e-15 | terahertz (THz) | |
| 1.00000e-18 | petahertz (PHz) |
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