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Information about Revolutions Per Minute

"RPM" redirects here. For other uses, see Rpm (disambiguation). For Les Mills' RPM see RPM (Chereographed Indoor Cycle Class)..


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.

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.

The corresponding International System of Units (SI) unit would be the hertz and we have:
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):
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 reaching 165 000 r/min.[3]
  • An electromechanical battery (EMB) works at 60 000 - 200 000 rpm range using a passively magnetic levitated flywheel in vacuum[4]. The choice of the flywheel material is not the most dense, but the one that pulverises the most safely, 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.

See also

References

1. ^ FIA on Formula One Engines. FIA.com. Retrieved on 2006-12-11.
2. ^ Slender and Elegant, It Fuels the Bomb. electricityforum.com. Retrieved on 2006-09-24.
3. ^ JetCat P-60 turbine specification page. jetcat.com. Retrieved on 2006-07-19.
4. ^ original paper. llnl.gov.
RPM may refer to:
  • Revolutions per minute
  • RPM International Inc, a chemical sealant company
  • RPM Package Manager, a software package manager
  • Les Mills International fitness program (RPM)
  • Raised pavement marker, on U.S.

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units of measurement have played a crucial role in human endeavour from early ages up to this day. Disparate systems of measurement used to be very common. Now there is a global standard, the International System (SI) of units, the modern form of the metric system.
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FreQuency is a music video game developed by Harmonix and published by SCEI. It was released in November 2001. A sequel, titled Amplitude was released in 2003.
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Rotation around a fixed axis is a special case of rotational motion, which does not involve those phenomena. The kinematics and dynamics of rotation around a fixed axis of a rigid object are mathematically much simpler than those for rotation of a rigid body; they are entirely
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Rotational speed (sometimes called speed of revolution) indicates, for example, how fast a motor is running. Rotational speed is equivalent to angular speed, but with different units. Rotational speed tells how many complete rotations (i.e.
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angular velocity is a vector quantity (more precisely, a pseudovector) which specifies the angular speed at which an object is rotating along with the direction in which it is rotating.
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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,
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Si, si, or SI may refer to (all SI unless otherwise stated):

In language:
  • One of two Italian words:
  • sì (accented) for "yes"
  • si

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hertz (symbol: Hz) is the SI unit of frequency. Its base unit is cycle/s or s-1 (also called inverse seconds, reciprocal seconds). In English, hertz is used as both singular and plural.
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second (SI symbol: s), sometimes abbreviated sec., is the name of a unit of time, and is the International System of Units (SI) base unit of time.

SI prefixes are frequently combined with the word second to denote subdivisions of the second, e.g.
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The radian per second (symbol: rad·s−1 or rad/s) is the SI unit of angular velocity.

The radian per second is defined as the change in the orientation of an object, in radians, every second.
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List of orders of magnitude for angular velocity
Factor (rad·s−1) Value (rad·s−1) Value (rpm) Item
10−16 8.8510−16 to 7.9610−16[1] 8.4510−15 to 7.
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gramophone record (also phonograph record, or simply record) is an analogue sound storage medium consisting of a flat disc with an inscribed modulated spiral groove starting near the periphery and ending near the center of the disc.
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A dental drill (or dentist's drill) is a small, high-speed drill used in dentistry to remove decayed tooth material prior to the insertion of a dental filling. Dental drills are used in the treatment of dental caries.
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Audio CD is an umbrella term that refers to many standards of means of playing back audio on a CD or even a DVD.

Standards

CD
  • Red Book audio - the original means of playing back audio on the medium.
  • 5.

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Washing Machine
(1995) Made in USA
(1995)

Washing Machine is an album by the band Sonic Youth. It was released shortly after the group concluded their stint headlining the 1995 Lollapalooza music festival.
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automobile (from Greek auto, self and Latin mobile moving, a vehicle that moves itself rather than being moved by another vehicle or animal) or motor car (usually shortened to just car) is a wheeled passenger vehicle that carries its own motor.
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An engine is something that produces an output effect from a given input. The origin of engineering however, came from the design, building and working of (military "engines") because before such devices came to be employed in battles there were very few mechanical devices used.
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The term aircraft engine, for the purposes of this article, refers to reciprocating and rotary internal combustion engines used in aircraft. Jet engines and turboprops are the other common aviation power plants; while operation differs substantially, the basics here apply to all
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Hard disk drive

An IBM hard disk drive with the metal cover removed. The platters are highly reflective.
Date Invented: September 13 1956
Invented By: An IBM team led by Reynold Johnson
Connects to:
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Advanced Technology Attachment (ATA) is a standard interface for connecting storage devices such as hard disks and CD-ROM drives inside personal computers.

The standard is maintained by X3/INCITS committee T13.
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SATA
Serial ATA

First generation (1.5 Gbit/s) SATA ports on a motherboard
Year created: 2003



Number of devices: 1
Capacity 1.5 Gbit/s, 3.
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SCSI (Small Computer System Interface) is a set of standards for physically connecting and transferring data between computers and peripheral devices. The SCSI standards define commands, protocols, and electrical and optical interfaces.
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Fibre Channel is a gigabit-speed network technology primarily used for storage networking. Fibre Channel is standardized in the T11 Technical Committee of the InterNational Committee for Information Technology Standards (INCITS), an American National Standards Institute
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Category Single seaters
Country or region International
Inaugural season 1950[1]
Drivers 22
Teams 11
Engine suppliers 6
Drivers' champion Fernando Alonso
Official website formula1.
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Zippe-type centrifuge is a device designed to collect Uranium-235. It was developed in the Soviet Union by a team of 60 German scientists working in detention, captured after World War II. The centrifuge is named after the team's lead experimenter, Gernot Zippe.
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gas turbine extracts energy from a flow of hot gas produced by combustion of gas or fuel oil in a stream of compressed air. It has an upstream air compressor (radial or axial flow) mechanically coupled to a downstream turbine and a combustion chamber in between.
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An electromechanical battery[1] is a device to store energy in a flywheel, with some motor to accelerate it, and some generator to draw energy from it.

Figures of merit

Devices to be used as batteries are qualified through the following elements of appreciation:

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    turbocharger (short for turbine driven supercharger) is an exhaust gas driven forced induction supercharger used in internal combustion engines. This differentiates it from a normal supercharger (or blower) which uses a prime mover to power the compression device.
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    List of orders of magnitude for angular velocity
    Factor (rad·s−1) Value (rad·s−1) Value (rpm) Item
    10−16 8.8510−16 to 7.9610−16[1] 8.4510−15 to 7.
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