Alphabet archive · R
R glossary entries
R glossary archive with 17 engineering terms across 10 disciplines, linking definitions to canonical Atlas of Engineering branch pages.
Rack power density is the electrical power assigned to or consumed by a data center rack, commonly expressed in kilowatts per rack.
Energy EngineeringRadiation dose describes how much ionizing radiation energy is deposited in material or tissue.
Engineering PhysicsReaction rate is the rate at which a chemical species is consumed or produced by reaction.
Chemical EngineeringReactive power is the component of apparent power in an AC circuit that oscillates between the source and reactive elements — inductors and capacitors — without being converted into useful work or heat, representing energy temporarily stored in magnetic or electric fields.
Electrical EngineeringAn electrically operated switching device used for control, protection, or isolation.
Electrical EngineeringThe probability that a system performs its required function for a specified time under stated conditions.
Industrial and Management EngineeringLarge-amplitude response that occurs when excitation frequency is near a natural frequency.
Mechanical EngineeringA retaining wall is a civil structure that holds back soil, rock, water, or granular fill where a stable natural slope cannot be used.
Civil and Construction EngineeringThe Reynolds number is a dimensionless ratio of inertial forces to viscous forces in a fluid flow.
Mechanical EngineeringRheology is the study of how materials flow, yield, relax, and deform under applied stress or strain.
Chemical EngineeringRighting arm is the horizontal lever arm between buoyancy and weight forces for a heeled floating body.
Naval and Marine EngineeringRisk Priority Number is a prioritisation score used in FMEA, typically calculated from severity, occurrence, and detection rankings.
Industrial and Management EngineeringRock mass rating is a geotechnical classification method used to summarize rock mass quality for excavation, slope, and support decisions.
Mining and Georesources EngineeringRoot locus is a graphical control-design method that shows how closed-loop poles move in the complex plane as a gain or parameter changes.
Automation and Control EngineeringRotor dynamics is the study of vibration, stability, and dynamic forces in shafts, disks, bearings, seals, and other rotating machinery.
Mechanical EngineeringRound-trip efficiency is the ratio of energy delivered by an energy storage system to the energy required to charge it over a defined cycle and boundary.
Energy EngineeringRunout is the measured deviation of a rotating surface or feature from ideal circular, coaxial, or axial alignment relative to a datum.
Mechanical Engineering