Revolutions per minute - Wikipedia, the free encyclopedia. Revolutions per minute (abbreviated rpm, RPM, rev/min, r/min) is a measure of the frequency of rotation, specifically the number of rotations around a fixed axis in one minute.
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It is used as a measure of rotational speed of a mechanical component. In the French language, tr/mn (tours par minute) is the common abbreviation. The German language uses the abbreviation U/min or u/min (Umdrehungen pro Minute). International System of Units. This is because the word revolution is a semanticannotation rather than a unit. The annotation is instead done as a subscript of the formula sign if needed. Because of the measured physical quantity, the formula sign has to be f for (rotational) frequency and .
The corresponding basic SI derived unit is s. When measuring angular speed, the unit radians per second is used. Formally, hertz (Hz) and radian per second (rad/s) are two different names for the same SI unit, s. However, they are used for two different but proportional ISQ quantities: frequency and angular frequency (angular speed, magnitude of angular velocity). The conversion between a frequency f (measured in hertz) and an angular velocity . If it instead is considered a unit of angular velocity and the word . Gramophone (phonograph) records, for example, typically rotate steadily at 1.
The disc's rotational speed varies from 2. Hz (1. 53. 0 rpm) when reading at the innermost edge, to 1. Hz (6. 30 rpm) at the outer edge. Thus an eight- cylinder engine turning 3. Hz. A piston aircraft engine typically rotates at a rate between 2. High- performance drives (used in fileservers and enthusiast- gaming PCs) rotate at 1. Hz), usually with higher- level SATA, SCSI or Fibre Channel interfaces and smaller platters to allow these higher speeds, the reduction in storage capacity and ultimate outer- edge speed paying off in much quicker access time and average transfer speed thanks to the high spin rate.
Until recently, lower- end and power- efficient laptop drives could be found with 4. Hz), but these have fallen out of favour due to their lower performance, improvements in energy efficiency in faster models and the takeup of solid- state drives for use in slimline and ultraportable laptops. Similar to CD and DVD media, the amount of data that can be stored or read for each turn of the disc is greater at the outer edge than near the spindle; however, hard drives keep a constant rotational speed so the effective data rate is faster at the edge (conventionally, the . Some designs such as those used with older Apple computers (Lisa, early Macintosh, later II's) were more complex and used variable rotational speeds and per- track storage density (at a constant read/record rate) to store more data per disc; for example, between 3. Mac's 8. 00 KB double- density drive at a constant 3.
KB/s (max) . 3. 00 rpm, 7. KB and 2. 3 KB/s (max) for double- density drives in other machines. Jet. Cat model aircraft turbines are capable of over 1. Hz) with the fastest reaching 1.
Hz). The rotation rates of bacterial flagella have been measured to be 1. Hz) for Salmonella typhimurium, 1. Hz) for Escherichia coli, and up to 1. Hz) for polar flagellum of Vibrio alginolyticus, allowing the latter organism to move in simulated natural conditions at a maximum speed of 5. Moving Picture Experts Group (MPEG). The Electricity Forum.
Science & Technology Review. University of California: 1. Bibcode: 1. 99. 4Natur.
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