ABSTRACT
Non-uniform are systems that consist of several physically uniform phases or uniform bodies, so that within the systems there are discontinuities in the continuity of the variation of their properties. These systems are the aggregates or different aggregate states of the same substance (ice-water, water-vapour, etc.), or various crystalline modifications (gray and white tin, etc.), or various products of mutual dissolution (aqueous salt solution – solid salt – vapour), or products of chemical interaction of various substances (a liquid alloy and a solid chemical compound of two metals).
