suhtelise ruumalamuutuse mõõt: kolme üksteisega risti oleva peamoone algebraline summa materjalis (vt moone, peamoone; vrd normaalmoone, nihkemoone), measure of the relative change in volume: the algebraic sum of three mutually perpendicular principal strains in a material (see: strain, principal strain; compare: normal strain, shear strain)