mahumoone, mahumuutus, ruumdeformatsioon, ruummoone, mahtdeformatsioon
materjali kolme vastastikku risti oleva peamoonde algebraline summa (vt peamoone; vrd normaalmoone, nihkemoone), the algebraic sum of three mutually perpendicular principal strains in a material (see: principal strain; compare: normal strain, shear strain)
