longitudinal valleylongitudinal walllongitudinal wavelongitudinal wave velocitylongshore currentlooploopholelooping pipelooseloose knotloose measure volumeloose sandloose yardlooseness factorlorrylos angeles abrasion testlossloss due to elastic shorteningloss of energyloss of headloss of pressureloss of weightlosses in laminar flowlost head naillost of ignitionlost timelost worklouverlove wavelow alkalilow alkali cementlow beamlow damlow density arealow density concretelow head siphonlow heat cementlow heat portland cementlow humplow pressure steam curinglow rate trickling filterlow relaxation steellow waterlower banklower bound solutionlower bound theorylower critical velocitylower leglower reachlower yield