👉 Non-plasticity is a phenomenon in physics and chemistry that describes how systems tend to resist changes in their state of matter. In other words, if you change the shape or size of a substance without changing its chemical composition, it will not break down into smaller pieces or undergo any physical transformations. For example, consider a metal rod with a uniform cross-section. If you cut it along one edge and then flatten it out, the resulting rod will have a different length than if it had been cut