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 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.
Hertz | Rotations per minute |
---|---|
0
Hz
|
0
rpm
|
10
Hz
|
600
rpm
|
20
Hz
|
1200
rpm
|
30
Hz
|
1800
rpm
|
40
Hz
|
2400
rpm
|
50
Hz
|
3000
rpm
|
60
Hz
|
3600
rpm
|
70
Hz
|
4200
rpm
|
80
Hz
|
4800
rpm
|
90
Hz
|
5400
rpm
|
100
Hz
|
6000
rpm
|
110
Hz
|
6600
rpm
|
120
Hz
|
7200
rpm
|
130
Hz
|
7800
rpm
|
140
Hz
|
8400
rpm
|
150
Hz
|
9000
rpm
|
160
Hz
|
9600
rpm
|
170
Hz
|
10200
rpm
|
180
Hz
|
10800
rpm
|
190
Hz
|
11400
rpm
|
200
Hz
|
12000
rpm
|
210
Hz
|
12600
rpm
|
220
Hz
|
13200
rpm
|
230
Hz
|
13800
rpm
|
240
Hz
|
14400
rpm
|
250
Hz
|
15000
rpm
|
260
Hz
|
15600
rpm
|
270
Hz
|
16200
rpm
|
280
Hz
|
16800
rpm
|
290
Hz
|
17400
rpm
|
300
Hz
|
18000
rpm
|
310
Hz
|
18600
rpm
|
320
Hz
|
19200
rpm
|
330
Hz
|
19800
rpm
|
340
Hz
|
20400
rpm
|
350
Hz
|
21000
rpm
|
360
Hz
|
21600
rpm
|
370
Hz
|
22200
rpm
|
380
Hz
|
22800
rpm
|
390
Hz
|
23400
rpm
|
400
Hz
|
24000
rpm
|
410
Hz
|
24600
rpm
|
420
Hz
|
25200
rpm
|
430
Hz
|
25800
rpm
|
440
Hz
|
26400
rpm
|
450
Hz
|
27000
rpm
|
460
Hz
|
27600
rpm
|
470
Hz
|
28200
rpm
|
480
Hz
|
28800
rpm
|
490
Hz
|
29400
rpm
|
500
Hz
|
30000
rpm
|
510
Hz
|
30600
rpm
|
520
Hz
|
31200
rpm
|
530
Hz
|
31800
rpm
|
540
Hz
|
32400
rpm
|
550
Hz
|
33000
rpm
|
560
Hz
|
33600
rpm
|
570
Hz
|
34200
rpm
|
580
Hz
|
34800
rpm
|
590
Hz
|
35400
rpm
|
600
Hz
|
36000
rpm
|
610
Hz
|
36600
rpm
|
620
Hz
|
37200
rpm
|
630
Hz
|
37800
rpm
|
640
Hz
|
38400
rpm
|
650
Hz
|
39000
rpm
|
660
Hz
|
39600
rpm
|
670
Hz
|
40200
rpm
|
680
Hz
|
40800
rpm
|
690
Hz
|
41400
rpm
|
700
Hz
|
42000
rpm
|
710
Hz
|
42600
rpm
|
720
Hz
|
43200
rpm
|
730
Hz
|
43800
rpm
|
740
Hz
|
44400
rpm
|
750
Hz
|
45000
rpm
|
760
Hz
|
45600
rpm
|
770
Hz
|
46200
rpm
|
780
Hz
|
46800
rpm
|
790
Hz
|
47400
rpm
|
800
Hz
|
48000
rpm
|
810
Hz
|
48600
rpm
|
820
Hz
|
49200
rpm
|
830
Hz
|
49800
rpm
|
840
Hz
|
50400
rpm
|
850
Hz
|
51000
rpm
|
860
Hz
|
51600
rpm
|
870
Hz
|
52200
rpm
|
880
Hz
|
52800
rpm
|
890
Hz
|
53400
rpm
|
900
Hz
|
54000
rpm
|
910
Hz
|
54600
rpm
|
920
Hz
|
55200
rpm
|
930
Hz
|
55800
rpm
|
940
Hz
|
56400
rpm
|
950
Hz
|
57000
rpm
|
960
Hz
|
57600
rpm
|
970
Hz
|
58200
rpm
|
980
Hz
|
58800
rpm
|
990
Hz
|
59400
rpm
|
1000
Hz
|
60000
rpm
|
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