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. 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).
According to the International System of Units (SI), rpm is not a unit. This is because the word revolution is a semantic annotation 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 ω or Ω for angular velocity. The corresponding basic SI derived unit is s−1 or Hz. When measuring angular speed, the unit radians per second is used.
Here the sign ↔ (correspondent) is used instead of = (equal). Formally, hertz (Hz) and radian per second (rad/s) are two different names for the same SI unit, s−1. 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 ω (measured in radians per second) are:
RPM is an abbreviation of revolutions per minute, a measure of rotation frequency.
RPM may also refer to:
The LP (long play), or 33 1⁄3 rpm microgroove vinyl record, is a format for phonograph (gramophone) records, an analog sound storage medium. Introduced by Columbia Records in 1948, it was soon adopted as a new standard by the entire record industry. Apart from relatively minor refinements and the important later addition of stereophonic sound capability, it has remained the standard format for vinyl albums.
At the time the LP was introduced, nearly all phonograph records for home use were made of an abrasive (and therefore noisy) shellac compound, employed a much larger groove, and played at approximately 78 revolutions per minute (rpm), limiting the playing time of a 12-inch diameter record to less than five minutes per side. The new product was a 12- or 10-inch (30 or 25 cm) fine-grooved disc made of vinyl and played with a smaller-tipped "microgroove" stylus at a speed of 33 1⁄3 rpm. Each side of a 12-inch LP could play for more than 20 minutes. Only the microgroove standard was truly new, as both vinyl and the 33 1⁄3 rpm speed had been used for special purposes for many years, as well as in one unsuccessful earlier attempt to introduce a long-playing record for home use.
Seu corpo é fruto proibido
É a chave de todo o pecado
E da libido, e pr'um garoto introvertido
Como eu é a pura perdição
É um lago negro o seu olhar
É água turva de beber, se envenenar
Nas suas curvas derrapar, sair da estrada
E morrer no mar, no mar
É perigoso o seu sorriso,
É um sorriso assim jocoso, impreciso
Diria, misterioso, indecifrável
Riso de mulher!
Não sei se é caça ou caçadora, se Diana ou Afrodite
Ou se é Brigite, Stephanie de Mônaco aqui estou
Inteiro ao seu dispor... princesa!
Pobre de mim, invento rimas assim pra você
E o outro vem em cima e você nem pra me escutar
Pois acabou, não vou rimar coisa nenhuma
Agora vai como sair que eu já não quero nem saber
Se vai caber ou vão me censurar! Será?
E pra você eu deixo apenas meu olhar 43
Aquele assim, meio de lado, já saindo
Indo embora, louco por você
Que pena...