Thepaperaimsatadetaileddescriptionofthephysicalbackgroundfortheso-calledCoriolismassflowmeter.Itpresentsessentiallyananalysisofthe(free)vibrationmodesofafluidconveyingstraightpipesegment.Duetotheinertialeffectsoftheflowingfluid,mMnlytheCoriolisforce,thesemodes