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.
Megahertz (MHz) is a common unit of frequency that represents one million cycles per second and is particularly known for its vital role in telecommunications and computing. The term hertz pays homage to Heinrich Hertz, the first person to conclusively prove the existence of electromagnetic waves. In radio broadcasting, the station dial numbers you tune into represent megahertz, which indicate the carrier frequency of the radio station. For example, a frequency of 101.1 MHz means the wave completes 101.1 million cycles every second!
In computing, the speed of the early personal computers was often measured in megahertz. Though we’ve progressed to gigahertz in modern-day processors, the megahertz era marked some groundbreaking advancements in technology. The original IBM PC, introduced in 1981, had a processor speed of just 4.77 MHz. Today, such performance pales in comparison, revealing the incredible strides in processing power over the decades.
Rotations per minute | Megahertz |
---|---|
0
rpm
|
0
MHz
|
50
rpm
|
8.33333e-7
MHz
|
100
rpm
|
1.66667e-6
MHz
|
150
rpm
|
0.0000025
MHz
|
200
rpm
|
3.33333e-6
MHz
|
250
rpm
|
4.16667e-6
MHz
|
300
rpm
|
0.000005
MHz
|
350
rpm
|
5.83333e-6
MHz
|
400
rpm
|
6.66667e-6
MHz
|
450
rpm
|
0.0000075
MHz
|
500
rpm
|
8.33333e-6
MHz
|
550
rpm
|
9.16667e-6
MHz
|
600
rpm
|
0.00001
MHz
|
650
rpm
|
1.08333e-5
MHz
|
700
rpm
|
1.16667e-5
MHz
|
750
rpm
|
0.0000125
MHz
|
800
rpm
|
1.33333e-5
MHz
|
850
rpm
|
1.41667e-5
MHz
|
900
rpm
|
0.000015
MHz
|
950
rpm
|
1.58333e-5
MHz
|
1000
rpm
|
1.66667e-5
MHz
|
1050
rpm
|
0.0000175
MHz
|
1100
rpm
|
1.83333e-5
MHz
|
1150
rpm
|
1.91667e-5
MHz
|
1200
rpm
|
0.00002
MHz
|
1250
rpm
|
2.08333e-5
MHz
|
1300
rpm
|
2.16667e-5
MHz
|
1350
rpm
|
0.0000225
MHz
|
1400
rpm
|
2.33333e-5
MHz
|
1450
rpm
|
2.41667e-5
MHz
|
1500
rpm
|
0.000025
MHz
|
1550
rpm
|
2.58333e-5
MHz
|
1600
rpm
|
2.66667e-5
MHz
|
1650
rpm
|
0.0000275
MHz
|
1700
rpm
|
2.83333e-5
MHz
|
1750
rpm
|
2.91667e-5
MHz
|
1800
rpm
|
0.00003
MHz
|
1850
rpm
|
3.08333e-5
MHz
|
1900
rpm
|
3.16667e-5
MHz
|
1950
rpm
|
0.0000325
MHz
|
2000
rpm
|
3.33333e-5
MHz
|
2050
rpm
|
3.41667e-5
MHz
|
2100
rpm
|
0.000035
MHz
|
2150
rpm
|
3.58333e-5
MHz
|
2200
rpm
|
3.66667e-5
MHz
|
2250
rpm
|
0.0000375
MHz
|
2300
rpm
|
3.83333e-5
MHz
|
2350
rpm
|
3.91667e-5
MHz
|
2400
rpm
|
0.00004
MHz
|
2450
rpm
|
4.08333e-5
MHz
|
2500
rpm
|
4.16667e-5
MHz
|
2550
rpm
|
0.0000425
MHz
|
2600
rpm
|
4.33333e-5
MHz
|
2650
rpm
|
4.41667e-5
MHz
|
2700
rpm
|
0.000045
MHz
|
2750
rpm
|
4.58333e-5
MHz
|
2800
rpm
|
4.66667e-5
MHz
|
2850
rpm
|
0.0000475
MHz
|
2900
rpm
|
4.83333e-5
MHz
|
2950
rpm
|
4.91667e-5
MHz
|
3000
rpm
|
0.00005
MHz
|
3050
rpm
|
5.08333e-5
MHz
|
3100
rpm
|
5.16667e-5
MHz
|
3150
rpm
|
0.0000525
MHz
|
3200
rpm
|
5.33333e-5
MHz
|
3250
rpm
|
5.41667e-5
MHz
|
3300
rpm
|
0.000055
MHz
|
3350
rpm
|
5.58333e-5
MHz
|
3400
rpm
|
5.66667e-5
MHz
|
3450
rpm
|
0.0000575
MHz
|
3500
rpm
|
5.83333e-5
MHz
|
3550
rpm
|
5.91667e-5
MHz
|
3600
rpm
|
0.00006
MHz
|
3650
rpm
|
6.08333e-5
MHz
|
3700
rpm
|
6.16667e-5
MHz
|
3750
rpm
|
0.0000625
MHz
|
3800
rpm
|
6.33333e-5
MHz
|
3850
rpm
|
6.41667e-5
MHz
|
3900
rpm
|
0.000065
MHz
|
3950
rpm
|
6.58333e-5
MHz
|
4000
rpm
|
6.66667e-5
MHz
|
4050
rpm
|
0.0000675
MHz
|
4100
rpm
|
6.83333e-5
MHz
|
4150
rpm
|
6.91667e-5
MHz
|
4200
rpm
|
0.00007
MHz
|
4250
rpm
|
7.08333e-5
MHz
|
4300
rpm
|
7.16667e-5
MHz
|
4350
rpm
|
0.0000725
MHz
|
4400
rpm
|
7.33333e-5
MHz
|
4450
rpm
|
7.41667e-5
MHz
|
4500
rpm
|
0.000075
MHz
|
4550
rpm
|
7.58333e-5
MHz
|
4600
rpm
|
7.66667e-5
MHz
|
4650
rpm
|
0.0000775
MHz
|
4700
rpm
|
7.83333e-5
MHz
|
4750
rpm
|
7.91667e-5
MHz
|
4800
rpm
|
0.00008
MHz
|
4850
rpm
|
8.08333e-5
MHz
|
4900
rpm
|
8.16667e-5
MHz
|
4950
rpm
|
0.0000825
MHz
|
5000
rpm
|
8.33333e-5
MHz
|
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