Hertz (Hz), the unit of frequency, measures the number of cycles per second. It’s named after Heinrich Hertz, the physicist who first proved the existence of electromagnetic waves. In 1888, his groundbreaking experiments paved the way for the development of radio, television, and other communication technologies. Fascinatingly, the concept of frequency extends well beyond sound — it’s also crucial in physics, describing phenomena such as light waves and even the rotation of electron orbitals.
In our everyday lives, Hertz is everywhere. When you listen to music, the pitch you hear is influenced by the frequency in Hertz, with middle C on a piano vibrating at about 261.6 Hz. Even your household electrical system operates at frequencies of 50 or 60 Hz, depending on your region. This widespread influence underscores how integral Hertz is to both technology and daily experiences.
The millihertz (mHz) is a unit of frequency equal to one-thousandth of a hertz. While it sounds minuscule, frequencies at this scale have critical applications in science and technology. For example, the Earth’s rotation slows down over time, a phenomenon observable at the millihertz level. Measuring such tiny variations requires precise timing methods, akin to those used in atomic clocks that define international time standards.
In the realm of biology, certain very slow rhythms in the human body, such as some brainwave patterns, occur at millihertz frequencies. Understanding these subtle oscillations can provide insights into sleep cycles and neurological conditions. Millihertz frequencies are also employed in geophysics for monitoring seismic activities and gravitational wave detection, highlighting their significance in uncovering the mysteries of the universe.
Hertz | Millihertz |
---|---|
0
Hz
|
0
mHz
|
10
Hz
|
10000
mHz
|
20
Hz
|
20000
mHz
|
30
Hz
|
30000
mHz
|
40
Hz
|
40000
mHz
|
50
Hz
|
50000
mHz
|
60
Hz
|
60000
mHz
|
70
Hz
|
70000
mHz
|
80
Hz
|
80000
mHz
|
90
Hz
|
90000
mHz
|
100
Hz
|
100000
mHz
|
110
Hz
|
110000
mHz
|
120
Hz
|
120000
mHz
|
130
Hz
|
130000
mHz
|
140
Hz
|
140000
mHz
|
150
Hz
|
150000
mHz
|
160
Hz
|
160000
mHz
|
170
Hz
|
170000
mHz
|
180
Hz
|
180000
mHz
|
190
Hz
|
190000
mHz
|
200
Hz
|
200000
mHz
|
210
Hz
|
210000
mHz
|
220
Hz
|
220000
mHz
|
230
Hz
|
230000
mHz
|
240
Hz
|
240000
mHz
|
250
Hz
|
250000
mHz
|
260
Hz
|
260000
mHz
|
270
Hz
|
270000
mHz
|
280
Hz
|
280000
mHz
|
290
Hz
|
290000
mHz
|
300
Hz
|
300000
mHz
|
310
Hz
|
310000
mHz
|
320
Hz
|
320000
mHz
|
330
Hz
|
330000
mHz
|
340
Hz
|
340000
mHz
|
350
Hz
|
350000
mHz
|
360
Hz
|
360000
mHz
|
370
Hz
|
370000
mHz
|
380
Hz
|
380000
mHz
|
390
Hz
|
390000
mHz
|
400
Hz
|
400000
mHz
|
410
Hz
|
410000
mHz
|
420
Hz
|
420000
mHz
|
430
Hz
|
430000
mHz
|
440
Hz
|
440000
mHz
|
450
Hz
|
450000
mHz
|
460
Hz
|
460000
mHz
|
470
Hz
|
470000
mHz
|
480
Hz
|
480000
mHz
|
490
Hz
|
490000
mHz
|
500
Hz
|
500000
mHz
|
510
Hz
|
510000
mHz
|
520
Hz
|
520000
mHz
|
530
Hz
|
530000
mHz
|
540
Hz
|
540000
mHz
|
550
Hz
|
550000
mHz
|
560
Hz
|
560000
mHz
|
570
Hz
|
570000
mHz
|
580
Hz
|
580000
mHz
|
590
Hz
|
590000
mHz
|
600
Hz
|
600000
mHz
|
610
Hz
|
610000
mHz
|
620
Hz
|
620000
mHz
|
630
Hz
|
630000
mHz
|
640
Hz
|
640000
mHz
|
650
Hz
|
650000
mHz
|
660
Hz
|
660000
mHz
|
670
Hz
|
670000
mHz
|
680
Hz
|
680000
mHz
|
690
Hz
|
690000
mHz
|
700
Hz
|
700000
mHz
|
710
Hz
|
710000
mHz
|
720
Hz
|
720000
mHz
|
730
Hz
|
730000
mHz
|
740
Hz
|
740000
mHz
|
750
Hz
|
750000
mHz
|
760
Hz
|
760000
mHz
|
770
Hz
|
770000
mHz
|
780
Hz
|
780000
mHz
|
790
Hz
|
790000
mHz
|
800
Hz
|
800000
mHz
|
810
Hz
|
810000
mHz
|
820
Hz
|
820000
mHz
|
830
Hz
|
830000
mHz
|
840
Hz
|
840000
mHz
|
850
Hz
|
850000
mHz
|
860
Hz
|
860000
mHz
|
870
Hz
|
870000
mHz
|
880
Hz
|
880000
mHz
|
890
Hz
|
890000
mHz
|
900
Hz
|
900000
mHz
|
910
Hz
|
910000
mHz
|
920
Hz
|
920000
mHz
|
930
Hz
|
930000
mHz
|
940
Hz
|
940000
mHz
|
950
Hz
|
950000
mHz
|
960
Hz
|
960000
mHz
|
970
Hz
|
970000
mHz
|
980
Hz
|
980000
mHz
|
990
Hz
|
990000
mHz
|
1000
Hz
|
1000000
mHz
|
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