Revolutions per minute
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).
International System of Units
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:
VistA
The Veterans Information Systems and Technology Architecture (VISTA) is a nationwide information system and Electronic Health Record (EHR) developed and deployed by the U.S. Department of Veterans Affairs (VA) throughout the U.S. to all 1200+ healthcare sites of the Veterans Health Administration (VHA). The VHA manages the largest integrated healthcare network in the United States, providing care to over 8 million veterans, employing 180,000 medical personnel and operating 163 hospitals, over 800 clinics, and 135 nursing homes throughout the continental U.S., Alaska, and Hawaii on a single electronic healthcare information network.
VISTA consists of nearly 180 applications for clinical, financial, administrative, and infrastructure needs in VA integrated into a single, common database, permitting all VA applications to share one single, authoritative data source for all veteran-related care and services. The U.S. Congress has mandated the VA keep all veterans health information in one single authoritative system, and has mandated VISTA as this role.
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