R

R  

Ra

Ra   Rabbet   RAC Horsepower Rating   Racemic Mixture   Racing Line  
Rack and Pinion   Rack and Pinion Steering   Racking   Racon   rad  
Rad   Radar   Radar Altimeter   Radar Beam   Radar Detector  
Radar Mile   Radial   Radial Engine   Radial Force Variation   Radial Motion  
Radial Position   Radial Vibration   Radian   Radian per Second   Radiancy  
Radiant Exposure   Radiant Heating   Radiant Intensity   Radiant Panel Test   Radiated Noise  
Radiation   Radiation Absorbed Dose   Radiation Barrier   Radiation Belt   Radiation Field  
Radiation Intensity   Radiation Losses   Radiation Pattern   Radiation Resistance   Radiation Transport  
Radiator   Radiator Fan   Radical Axis   Radical Centre   Radii  
Radio   Radio Clock   Radio Direction Finder   Radio Frequency   Radio Frequency Amplifier  
Radio Frequency Choke   Radio Frequency Heating   Radio Frequency Interference   Radio Frequency Telemetry   Radio Horizon  
Radio Interference   Radio Interference Suppression   Radio Interferometer   Radio Waves   Radioactive Decay  
Radioactivity   Radiography   Radioisotope   Radiometer   Radiometer Vacuum Gauge  
Radiometry   Radionuclide   Radiosity Equation   Radiosonde   Radium  
Radius   Radius Gauge   Radix   Radix Point   Radome  
Radon   Rafter   Ragone Plot   Rain Bucket   Rain Gauge  
Rainflow Analysis   RAM   Ram Air   Ramjet   Ramp Voltage  
Ram-Rocket   Ramsay, William   Random Access   Random Access Memory   Random Copolymer  
Random Errors   Random Experiment   Random Noise   Random Number Generators   Random Process  
Random Sampling   Random Vibration   Random Wound Stator   Randomised Controlled Experiment   Range  
Range Extender   Range of Linear Transformation   Rankine Cycle   Rankine Temperature Scale   Rankine Vortex  
Rankine-Hugoniot Shock Relations   Raoult′s Law   Rapid Solidification Technology   Rapid Speech Transmission Index   Rare Earth  
Rare Earth Element   Rarefaction   Rarefied Wave   Rasp   RASTI  
Ratchet   Ratchet Brace   Rate Gyroscope   Rate Law   Rate of Change  
Rate of Reaction   Rate of Strain Hardening   Rated Flow   Rated Pressure   Ratio  
Ratio Detector   Ratio of Specific Heats   Rational B-Spline   Rational Function   Rational Number  
RATO   Rattle   Rawlplug   Ray   Ray Tracing  
Rayl   Rayleigh Criterion   Rayleigh Distribution   Rayleigh Scattering   Rayleigh Waves  
Rayleigh-Jeans Law   Rayleigh′s Method  

Rb

Rb   Rb2O   Rb2O2   Rb2S   RbBr  
RbCl   RbF   RbI   RbO2   RC Constant  
RC Differentiator   RC Filter   RC Integrator   RC Network   RC Oscillator  

Re

Re   Reactance   Reactance Amplifier   Reactance Tube   Reactance Tube Modulator  
Reactants   Reaction   Reaction Mechanism   Reaction Order   Reaction Quotient  
Reaction Rate   Reaction Time   Reactive Absorber   Reactive Intermediate   Reactive Power  
Reactive Silencer   Reactive Sound Field   Reactivity Index   Reactor   Reagent  
Real Axis   Real Gas Effects   Real Image   Real Modes   Real Number  
Real Part   Real Time Monitoring   Real Time Operation   Real Variable   Really Simple Syndication  
Ream   Rear Wheel Drive   Rearrangement Reaction   Reaumur Temperature Scale   Rebar Size  
Rebound   Receiver   Receiver Antenna   Receiver Noise Figure   Receiver Sensitivity  
Receiving Room   Recency Effect   Receptance   Receptor Site   Rechargeable Battery  
Reciprocal   Reciprocal Lattice   Reciprocal Megakelvin   Reciprocating   Reciprocating Air Compressor  
Reciprocity   Recombination   Recombination Era   Recruitment   Recruitment Weblinks  
Recrystallization   Recrystallization Annealing   Recrystallization Temperature   Rectangle   Rectangular Coordinates  
Rectangular Window   Rectifier   Recursion   Recursive Filter   Recycling  
Red Giant   Red Iron Oxide   Red Supergiant   Redox Indicator   Redox Potential  
Redox Reaction   Redox Titration   Redshift   Reduced Instruction Set Computer   Reducing Agent  
Reductant   Reduction   Reduction Half Reaction   Reduction of Area   Reduction Reaction  
Reference Electrode   Reference Line   Reference Oil   Reference Point   Reference Sound Source  
Reference System   Reflect   Reflected Sound   Reflected Wave   Reflecting Telescope  
Reflection   Reflection Nebula   Reflection Phase Grating   Reflex Angle   Reflex Klystron  
Reflow Soldering   Reformate   Reformer   Reforming   Reformulated Petrol  
Refracting Telescope   Refraction   Refractive Index   Refractory   Refrigerant  
Refrigeration   Refrigeration Oil   Refrigerator   Regelation   Regenerative Braking  
Regenerative Detector   Regenerative Feedback   Regenerative Fuel Cells   Regenerative Receiver   Register  
Regular Polygon   Regulator   Regulatory Enzyme   Regulatory Sequence   Rehoboam  
Reid Vapour Pressure   Reinforced Concrete   Reinforcing   Relative Bearing   Relative Density  
Relative Error   Relative Frequency   Relative Humidity   Relative Magnetic Permeability   Relative Position  
Relative Standard Deviation   Relative Temperature   Relatively Prime   Relativistic Kinetic Energy   Relativity  
Relaxation Oscillator   Relaxation Time   Relay   Reliability   Reliability Block Diagram  
Relief   Relief Valve   Reluctance   rem   Remainder  
Remanence   Remote Cutoff Tube   Remotely Piloted Vehicle   REN   Renaissance  
Renewable Energy   Renewable Parts   Repdigit   Repeatability   Repeater  
Repeating Decimal   Repeller   Report   Repulsive Force   Repunit  
Research Octane Number   Reservoir   Residual   Residual Elongation   Residual Induction  
Residual Intensity   Residual Interaction   Residual Magnetism   Residual Plot   Residual Stress  
Residual Terms   Residue   Resilience   Resilient Mounting   Resin  
Resin Transfer Moulding   Resistance   Resistance Brazing   Resistance Thermometer   Resistance Welding  
Resistive Load   Resistivity   Resistor   Resolution   Resolver  
Resonance   Resonance Effect   Resonant Circuit   Resonant Frequency   Resonant Line  
Resonator   Respiration   Response   Response Time   Rest Energy  
Rest Frequency   Rest Mass   Retentivity   Retrograde   Retroreflectors  
Reulatory Gene   Reverberant Sound Field   Reverberation   Reverberation Room   Reverberation Time  
Reverse Address Resolution Protocol   Reverse Bias   Reverse Osmosis   Reverse Thrust   Reversible Fuel Cell  
Revolution   Revolutions per Kilometre   Revolutions per Minute   Revolutions per Second   Reyn  
Reynolds Number   Reynolds Stresses   RF   RF Amplifier   RF Choke  
RF Radiation Hazard   RF Telemetry  

Rf

Rf Transformer   RFI   RGB  

Rh

Rh   rhenium   Rheology   Rheostat   rho  
Rhodium   Rhombic Antenna   Rhombus   Rhyolite  

Ri

Ribbon Cable   Riboflavin   Ribonucleic Acid   Ribosomal RNA   Ribosome  
Rich Combustion   Richardson Number   Richter Scale   Ride Height   Ride Quality  
Riffler   Right Angle   Right Atrium   Right Hand Thread   Right Hand Tractor Propeller  
Right Triangle   Right Ventricle   Rigid   Rigid Body Modes   Rigid Coaxial Line  
Rigid Connection   Rigid Joint   Ring   Ring Grooves   Ring Spanner  
Ringer Equivalence Number   Ringing   Ringing Oscillator   Ripping Hammer   Ripple Frequency  
Ripple Voltage   RISC   Rise Run   Rise Time   Risers  
Riveting Hammer   Rivets   RJ-11   RJ-45   RL Differentiator  
RL Integrator   RLC Circuit  

rm

rms  

Rn

Rn  

Ro

Road Noise   Roche Limit   Rock Tunnel   Rocker Arm   Rocket  
Rocket Assisted Takeoff   Rocket Engine   Rocket Fuel   Rocket Nozzle   Rocket Propellant  
Rocket Sled   Rocket Sounding   Rocketsonde   Rocking Grate   Rockoon  
Rockwell Hardness   Rococo   Rod   Roentgen   Roentgen Equivalent Man (rem)  
Roll   Roll Axis   Roll Bar   Roll Centre   Roll Cloud  
Roll Off   Rolled Thread   Roller Bearing   Roller Joint   Roller Support  
Roller Tappets   Rolling Drag   Rolling Friction   Rolling Resistance   ROM  
Roman Numerals   Romanesque   RON   Roof   Room  
Room Absorption   Room Acoustics   Room Constant   Room Modes   Root  
Root Mean Square   Root of Unity   Rosenbrock Function   Roses Alloy   Rosin  
Rotary Engine   Rotary Inverter   Rotary Pump   Rotary Switch   Rotate  
Rotating Field   Rotating Seal   Rotation   Rotational Inertia   Rotational Kinetic Energy  
Rotational Play   Rotor   Rotor Cloud   Rough Machining   Roughing  
Roughing Stone   Round File   Round Nose Chisel   Round Nose Pliers   Round Off  
Round Off Error   Round Window   Rounding   Round-Off Error   Router  
Router   Routing Information Protocol   Roving   Row Equivalent Matrices   Row Space of a Matrix  
RPK  

rp

rpm   rps   r-RNA   RS232   RS274  
RS422   RSI   RSS   RT60  

Ru

Ru   Rubber Mallet   Rubbing Alcohol   Rubbing Bearing   Rubidium  
Rubidium Bromide   Rubidium Chloride   Rubidium Fluoride   Rubidium Hydride   Rubidium Iodide  
Rubidium Oxide   Rubidium Peroxide   Rubidium Sulphide   Rubidium Superoxide   Rudder  
Ruled Surface   Ruler   Run-Flat Tyre   Running Fit   Running Modes  
Runout   Rupture   Rupture Strength   Rust   Rust Remover  
Rust Sealer   Rusty Compass   Rutan, Burt   Ruthenium   Rutherford, Ernest  
R-Value   RWD  

Ry

Rydberg Constant