Chemistry Dictionary & Glossary: Terms Starting with R RADIANT POWERRADIATIONRADICALRADICAL PAIR MECHANISM (RPM)RADIOACTIVE DATINGRADIOACTIVE TRACERRADIOACTIVITYRAOULT'S LAWRARE EARHSRATE OF REACTIONRATE-DETERMINING STEPRATE-LAW EXPRESSIONRAYLEIGH SCATTERINGRC CIRCUITREACTANTREACTION QUOTIENTREACTION RATIOREACTION STOICHIOMETRYREACTIVE PLASMA DEPOSITION (RPD)RECTIFIERREDOXREDUCED MASSREDUCING AGENTREDUCTIONREFRACTORY METALSRELATIVE DENSITYRELATIVITY PRINCIPLERELAXATION TIMESREMPIRESISTANCE THERMOMETERRESOLUTION (OF A LENS)RESONANCERESONANT TWO-PHOTON IONIZATION (R2PI)REST MASSRESTSTRAHLEN FILTERRESULTANTRETROREFLECTORREVERSE OSMOSISREVERSIBLE REACTIONREVERSIONREYNOLD’S NUMBERRHMERHOMBOID PRISMROLLING FRICTIONROOT-MEAN-SQUARE SPEED (RMS)ROOTS BLOWERROTATING DISK ELECTRODE (RDE)ROWLAND GHOSTSRUBY