valandi mahu ja joonmõõtmete tegelik vähenemine valumudeli mahu ja joonmõõtmetega võrreldes; valukahanemine on valusulami oluline tehnoloogiline omadus; metalli summaarses kahanemises valuvormis sulast olekust toatemperatuurini jahtumisel sisalduvad: tardumiseelkahanemine, tardumiskahanemine ja tardkahanemine (vt tardumiseelkahanemine; tardumiskahanemine; tardkahanemine), the amount of dimensional change per unit length of the casting as it solidifies in the mold or die and cools to room temperature after removal from the mold or die; there are three distinct types of casting shrinkage: 1) liquid shrinkage refer to the reduction in volume of liquid metal as it cools to the liquidus, 2) solidification shrinkage is the reduction in volume of metal from the beginning to the end of solidification, and 3) solid shrinkage involves the reduction in volume of metal from the solidus to room temperature