The rotation per minute (RPM) is a fascinating unit of rotational speed that measures the number of complete turns an object makes in one minute. Though RPM is most commonly associated with car engines and records players, it’s a vital metric in a wide array of industries, including aviation, where turbine engines can reach up to 10,000 RPMs. Fun fact: beyond Earth, RPM played a crucial part in the Apollo missions—during re-entry, the command module performed a slow spin at around 2 RPMs to ensure even heat distribution!
In the everyday whimsy of RPM, consider that your average washing machine can spin at an impressive 1,200 RPM during the spin cycle. Additionally, high-speed trains like the Japanese Shinkansen have wheels rotating at about 280 RPM while cruising at speeds over 300 km/h, showing how RPM bridges the gap between mundane household chores and cutting-edge transportation technology.
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.
Rotations per minute | Millihertz |
---|---|
0
rpm
|
0
mHz
|
50
rpm
|
833.33333
mHz
|
100
rpm
|
1666.66667
mHz
|
150
rpm
|
2500
mHz
|
200
rpm
|
3333.33333
mHz
|
250
rpm
|
4166.66667
mHz
|
300
rpm
|
5000
mHz
|
350
rpm
|
5833.33333
mHz
|
400
rpm
|
6666.66667
mHz
|
450
rpm
|
7500
mHz
|
500
rpm
|
8333.33333
mHz
|
550
rpm
|
9166.66667
mHz
|
600
rpm
|
10000
mHz
|
650
rpm
|
10833.33333
mHz
|
700
rpm
|
11666.66667
mHz
|
750
rpm
|
12500
mHz
|
800
rpm
|
13333.33333
mHz
|
850
rpm
|
14166.66667
mHz
|
900
rpm
|
15000
mHz
|
950
rpm
|
15833.33333
mHz
|
1000
rpm
|
16666.66667
mHz
|
1050
rpm
|
17500
mHz
|
1100
rpm
|
18333.33333
mHz
|
1150
rpm
|
19166.66667
mHz
|
1200
rpm
|
20000
mHz
|
1250
rpm
|
20833.33333
mHz
|
1300
rpm
|
21666.66667
mHz
|
1350
rpm
|
22500
mHz
|
1400
rpm
|
23333.33333
mHz
|
1450
rpm
|
24166.66667
mHz
|
1500
rpm
|
25000
mHz
|
1550
rpm
|
25833.33333
mHz
|
1600
rpm
|
26666.66667
mHz
|
1650
rpm
|
27500
mHz
|
1700
rpm
|
28333.33333
mHz
|
1750
rpm
|
29166.66667
mHz
|
1800
rpm
|
30000
mHz
|
1850
rpm
|
30833.33333
mHz
|
1900
rpm
|
31666.66667
mHz
|
1950
rpm
|
32500
mHz
|
2000
rpm
|
33333.33333
mHz
|
2050
rpm
|
34166.66667
mHz
|
2100
rpm
|
35000
mHz
|
2150
rpm
|
35833.33333
mHz
|
2200
rpm
|
36666.66667
mHz
|
2250
rpm
|
37500
mHz
|
2300
rpm
|
38333.33333
mHz
|
2350
rpm
|
39166.66667
mHz
|
2400
rpm
|
40000
mHz
|
2450
rpm
|
40833.33333
mHz
|
2500
rpm
|
41666.66667
mHz
|
2550
rpm
|
42500
mHz
|
2600
rpm
|
43333.33333
mHz
|
2650
rpm
|
44166.66667
mHz
|
2700
rpm
|
45000
mHz
|
2750
rpm
|
45833.33333
mHz
|
2800
rpm
|
46666.66667
mHz
|
2850
rpm
|
47500
mHz
|
2900
rpm
|
48333.33333
mHz
|
2950
rpm
|
49166.66667
mHz
|
3000
rpm
|
50000
mHz
|
3050
rpm
|
50833.33333
mHz
|
3100
rpm
|
51666.66667
mHz
|
3150
rpm
|
52500
mHz
|
3200
rpm
|
53333.33333
mHz
|
3250
rpm
|
54166.66667
mHz
|
3300
rpm
|
55000
mHz
|
3350
rpm
|
55833.33333
mHz
|
3400
rpm
|
56666.66667
mHz
|
3450
rpm
|
57500
mHz
|
3500
rpm
|
58333.33333
mHz
|
3550
rpm
|
59166.66667
mHz
|
3600
rpm
|
60000
mHz
|
3650
rpm
|
60833.33333
mHz
|
3700
rpm
|
61666.66667
mHz
|
3750
rpm
|
62500
mHz
|
3800
rpm
|
63333.33333
mHz
|
3850
rpm
|
64166.66667
mHz
|
3900
rpm
|
65000
mHz
|
3950
rpm
|
65833.33333
mHz
|
4000
rpm
|
66666.66667
mHz
|
4050
rpm
|
67500
mHz
|
4100
rpm
|
68333.33333
mHz
|
4150
rpm
|
69166.66667
mHz
|
4200
rpm
|
70000
mHz
|
4250
rpm
|
70833.33333
mHz
|
4300
rpm
|
71666.66667
mHz
|
4350
rpm
|
72500
mHz
|
4400
rpm
|
73333.33333
mHz
|
4450
rpm
|
74166.66667
mHz
|
4500
rpm
|
75000
mHz
|
4550
rpm
|
75833.33333
mHz
|
4600
rpm
|
76666.66667
mHz
|
4650
rpm
|
77500
mHz
|
4700
rpm
|
78333.33333
mHz
|
4750
rpm
|
79166.66667
mHz
|
4800
rpm
|
80000
mHz
|
4850
rpm
|
80833.33333
mHz
|
4900
rpm
|
81666.66667
mHz
|
4950
rpm
|
82500
mHz
|
5000
rpm
|
83333.33333
mHz
|
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