millihertzeista

Millihertz is a unit of frequency, a measure of how often a periodic event occurs per unit of time. Specifically, it represents one-thousandth of a hertz. A hertz (Hz) is defined as one cycle per second. Therefore, one millihertz (mHz) is equivalent to one cycle per 1000 seconds, or 0.001 Hz.

This unit is most commonly used to describe extremely low frequencies. For instance, astronomical phenomena often occur at very slow rates, making millihertz a suitable unit for their measurement. Examples include the orbital periods of very distant celestial bodies, the oscillations of certain types of stars, or the frequencies associated with gravitational wave signals. In geophysics, slow geological processes or seismic wave frequencies might also be expressed in millihertz.

The prefix "milli-" denotes a factor of 10 to the power of -3, meaning one-thousandth. So, 1 Hz equals 1000 mHz, and conversely, 1 mHz equals 0.001 Hz. When dealing with very slow, long-period events, using millihertz can simplify the notation compared to expressing the frequency in fractions of a hertz or in seconds per cycle. It allows for a more convenient numerical representation of these low-frequency phenomena.