relative compactionrelative densityrelative displacementrelative equilibriumrelative evaporationrelative heightrelative height of hydraulic jumprelative humidityrelative initial depthrelative linear motionrelative mean square errorrelative motionrelative orientationrelative permeabilityrelative precisionrelative restrelative rotationrelative roughnessrelative sequent depthrelative speedrelative stiffnessrelative velocityrelative wetnessrelaxationrelaxation at high temperaturerelaxation methodrelaxation of stressrelaxation testreleaserelease agentreleasedreleased structurereleasingreleasing agentreliabilityreliability criterionrelief displacementrelief overflowrelief roadrelief valverelief wellreliving archrelocationremakingremoldremolding testremote controlremote satelliteremouldremoulded clay