Revolutions per minute (abbreviated rpm, RPM, r/min, or r·min⁻¹) is a unit of frequency: the number of full rotations completed in one minute around a fixed axis. It is most commonly used as a measure of rotational speed or angular velocity of some mechanical component. Revolutions per minute is a unit of frequency, commonly used to measure rotational speed. ... The former Weights and Measures office in Middlesex, England. ... FreQuency is a music video game developed by Harmonix and published by SCEI. It was released in November 2001. ... The simplest three-dimensional case of rotation is rotation of a body about a fixed axis of rotation: each point of the body moves in a plane perpendicular to the axis, carrying out a circular motion, with the circle centered at the intersection of the plane and the axis. ... Rotational speed (sometimes called speed of revolution) indicates for example how fast the motor is running. ... Angular velocity describes the speed of rotation and the orientation of the instantaneous axis about which the rotation occurs. ...

Standards organizations generally recommend the symbol r/min, which is more consistent with the general use of unit symbols. This is not enforced as an international standard; in French, for example, tr/mn (tours par minute) is commonly used. A standards organization, also sometimes referred to as a standards body, a standards development organization or SDO (depending on what is being referenced), is any entity whose primary activities are developing, coordinating, promulgating, revising, amending, reissuing, interpreting, or otherwise maintaining standards that address the interests of a wide base of...

The corresponding International System of Units (SI) unit would be the hertz and we have: Look up si, Si, SI in Wiktionary, the free dictionary. ... MHZ redirects here. ...

1 r/min = (1/60) revolutions per second = 0.01666667 Hz

In the SI one often uses the unit for angular velocity which is radians per second (rad·s⁻¹): Look up second in Wiktionary, the free dictionary. ... The radian per second (symbol: rad/s) is the SI unit of angular velocity. ...

1 r/min = 2π rad·min⁻¹ = 2π/60 rad·s⁻¹ = 0.10471976 rad·s⁻¹

Examples

Main article: Orders of magnitude (angular velocity)

• On some kinds of disc or tape-like recording media, the rotational speed of the medium under the read head is a standard given in r/min. Gramophone (phonograph) records, for example, typically rotate steadily at 16, 33⅓, 45 or 78 r/min.
• Modern dental drills can rotate at up to 500,000 r/min.
• The second hand of a conventional analogue clock rotates at 1 r/min.
• Audio CD players read their discs at a constant 150KB/s and thus must vary the disc's rotational speed from around 500 r/min when reading at the innermost edge, and 180 r/min at the outer edge. CD-ROM drives have their maximum rotational speeds are rated in multiples of this figure, even though they do not hold to constant read speeds when reading from data tracks.
• A washing machine's drum may rotate at 500 to 1800 r/min during the spin cycles.
• An automobile's engine typically varies between 700 and 7000 r/min (though there are certain cars that can rev as high as 11,000 r/min.
• A piston aircraft engine typically rotates between 2000 and 3000 r/min.
• A computer's hard drive rotates at 3600, 4200, 5400, or 7200 r/min on IDE types and 10 000 or 15 000 r/min on some SATA and SCSI and Fibre Channel drives.
• The engine of a Formula One racing car can reach 20,000 r/min under some circumstances.^[1]
• A Zippe-type centrifuge for enriching uranium spins at 90 000 r/min or faster.^[2]
• Gas turbine engines rotate at tens of thousands of r/min. JetCat model aircraft turbines are capable of over 100 000 r/min with the fastest hitting 165 000 r/min.^[3]

• An electromechanical battery (EMB) works at 60 000 - 200 000 rpm range using magnetic levitated flywheel principle in vacuum^[4]. The choice of material of the flywheel is not the heaviest, but the more resistant to burst at surface speeds about 7 times the speed of sound.

• A turbocharger can reach 290 000 r/min while 80 000 - 200 000 r/min are common.

To help compare different orders of magnitude, the following list describes various angular velocity levels between 1×10−7 rad·s−1 and 1×107 rad·s−1. ... It has been suggested that Childrens gramophone records be merged into this article or section. ... A high-speed dental handpiece. ... CD re-directs here; see Cd for other meanings of CD. Image of a compact disc (pencil included for scale) A compact disc (or CD) is an optical disc used to store digital data, originally developed for storing digital audio. ... Front-loading washing machine. ... Karl Benzs Velo model (1894) - entered into the first automobile race An automobile or motor car (usually shortened to just car) is a wheeled passenger vehicle that carries its own motor. ... An engine in the broadest sense, is something that produces an output effect from a given input. ... To meet Wikipedias quality standards, this article or section may require cleanup. ... Typical hard drives of the mid-1990s. ... ATA cables: 40 wire ribbon cable top, 80 wire ribbon cable bottom Advanced Technology Attachment (ATA) is a standard interface for connecting storage devices such as hard disks and CD-ROM drives inside personal computers. ... First generation (1. ... This article or section does not cite any references or sources. ... This article or section does not adequately cite its references or sources. ... Formula One - Wikipedia, the free encyclopedia /**/ @import /skins-1. ... The Zippe-type centrifuge is a device designed to collect Uranium-235. ... This machine has a single-stage centrifugal compressor and turbine, a recuperator, and foil bearings. ... Air foil bearing-supported turbocharger cutaway made by Mohawk Innovative Technology Inc. ...

See also

• Orders of magnitude (angular velocity)
• Constant linear velocity, or CLV, used when referring to the speed of audio CDs
• Constant angular velocity, or CAV, used when referring the speed of gramophone (phonograph) records
• Turn (geometry)

To help compare different orders of magnitude, the following list describes various angular velocity levels between 1×10−7 rad·s−1 and 1×107 rad·s−1. ... Constant Linear Velocity (CLV) refers to how information is written to or read from a rotating data disk. ... Constant Angular Velocity (CAV) refers to how information is written to or read from a rotating data disk. ... ...

References