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.
Kilohertz (kHz), a unit of frequency equal to 1,000 hertz, is a central part of our digital world. It’s prominently used to measure frequencies of audio signals, radio transmissions, and clock speeds in computers. The human ear can typically hear sounds ranging from 20 Hz to 20 kHz. Interestingly, ultrasonic devices like bat echolocation operate at frequencies well beyond this range, often between 20 kHz and 200 kHz, allowing them sophistication in navigation and hunting that humans cannot directly experience.
In radio broadcasting, AM radio stations operate at kilohertz frequencies, generally between 530 kHz to 1700 kHz, catering to long-distance communication. This contrasts with FM radio, which uses the higher megahertz range. Understanding kilohertz can give insight into how different signals traverse space, influencing everything from global communications to wildlife studies.
Millihertz | Kilohertz |
---|---|
0
mHz
|
0
kHz
|
10
mHz
|
0.00001
kHz
|
20
mHz
|
0.00002
kHz
|
30
mHz
|
0.00003
kHz
|
40
mHz
|
0.00004
kHz
|
50
mHz
|
0.00005
kHz
|
60
mHz
|
0.00006
kHz
|
70
mHz
|
0.00007
kHz
|
80
mHz
|
0.00008
kHz
|
90
mHz
|
0.00009
kHz
|
100
mHz
|
0.0001
kHz
|
110
mHz
|
0.00011
kHz
|
120
mHz
|
0.00012
kHz
|
130
mHz
|
0.00013
kHz
|
140
mHz
|
0.00014
kHz
|
150
mHz
|
0.00015
kHz
|
160
mHz
|
0.00016
kHz
|
170
mHz
|
0.00017
kHz
|
180
mHz
|
0.00018
kHz
|
190
mHz
|
0.00019
kHz
|
200
mHz
|
0.0002
kHz
|
210
mHz
|
0.00021
kHz
|
220
mHz
|
0.00022
kHz
|
230
mHz
|
0.00023
kHz
|
240
mHz
|
0.00024
kHz
|
250
mHz
|
0.00025
kHz
|
260
mHz
|
0.00026
kHz
|
270
mHz
|
0.00027
kHz
|
280
mHz
|
0.00028
kHz
|
290
mHz
|
0.00029
kHz
|
300
mHz
|
0.0003
kHz
|
310
mHz
|
0.00031
kHz
|
320
mHz
|
0.00032
kHz
|
330
mHz
|
0.00033
kHz
|
340
mHz
|
0.00034
kHz
|
350
mHz
|
0.00035
kHz
|
360
mHz
|
0.00036
kHz
|
370
mHz
|
0.00037
kHz
|
380
mHz
|
0.00038
kHz
|
390
mHz
|
0.00039
kHz
|
400
mHz
|
0.0004
kHz
|
410
mHz
|
0.00041
kHz
|
420
mHz
|
0.00042
kHz
|
430
mHz
|
0.00043
kHz
|
440
mHz
|
0.00044
kHz
|
450
mHz
|
0.00045
kHz
|
460
mHz
|
0.00046
kHz
|
470
mHz
|
0.00047
kHz
|
480
mHz
|
0.00048
kHz
|
490
mHz
|
0.00049
kHz
|
500
mHz
|
0.0005
kHz
|
510
mHz
|
0.00051
kHz
|
520
mHz
|
0.00052
kHz
|
530
mHz
|
0.00053
kHz
|
540
mHz
|
0.00054
kHz
|
550
mHz
|
0.00055
kHz
|
560
mHz
|
0.00056
kHz
|
570
mHz
|
0.00057
kHz
|
580
mHz
|
0.00058
kHz
|
590
mHz
|
0.00059
kHz
|
600
mHz
|
0.0006
kHz
|
610
mHz
|
0.00061
kHz
|
620
mHz
|
0.00062
kHz
|
630
mHz
|
0.00063
kHz
|
640
mHz
|
0.00064
kHz
|
650
mHz
|
0.00065
kHz
|
660
mHz
|
0.00066
kHz
|
670
mHz
|
0.00067
kHz
|
680
mHz
|
0.00068
kHz
|
690
mHz
|
0.00069
kHz
|
700
mHz
|
0.0007
kHz
|
710
mHz
|
0.00071
kHz
|
720
mHz
|
0.00072
kHz
|
730
mHz
|
0.00073
kHz
|
740
mHz
|
0.00074
kHz
|
750
mHz
|
0.00075
kHz
|
760
mHz
|
0.00076
kHz
|
770
mHz
|
0.00077
kHz
|
780
mHz
|
0.00078
kHz
|
790
mHz
|
0.00079
kHz
|
800
mHz
|
0.0008
kHz
|
810
mHz
|
0.00081
kHz
|
820
mHz
|
0.00082
kHz
|
830
mHz
|
0.00083
kHz
|
840
mHz
|
0.00084
kHz
|
850
mHz
|
0.00085
kHz
|
860
mHz
|
0.00086
kHz
|
870
mHz
|
0.00087
kHz
|
880
mHz
|
0.00088
kHz
|
890
mHz
|
0.00089
kHz
|
900
mHz
|
0.0009
kHz
|
910
mHz
|
0.00091
kHz
|
920
mHz
|
0.00092
kHz
|
930
mHz
|
0.00093
kHz
|
940
mHz
|
0.00094
kHz
|
950
mHz
|
0.00095
kHz
|
960
mHz
|
0.00096
kHz
|
970
mHz
|
0.00097
kHz
|
980
mHz
|
0.00098
kHz
|
990
mHz
|
0.00099
kHz
|
1000
mHz
|
0.001
kHz
|
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