Homogeneous and heterogeneous mixtures mixture is air. In physical chemistry and materials science this refers to substances and mixtures which are in a single phase. This is in contrast to a substance that is heterogeneous. A solution has been a special type of homogeneous mixture. Solutions are homogeneous because the ratio of solute to solvent remains the same throughout the solution even if homogenized with multiple sources, and stable because the solute will not settle out after any period of time, and it cannot be removed by a filter or by centrifuge. This type of mixture is very stable, i.e., its particles do not
Mass fraction (chemistry) mass of the mixture. Replacing the expression of the molar mass-products: In a spatially non-uniform mixture, the mass fraction gradient gives rise to the phenomenon of diffusion. Mass fraction (chemistry) In chemistry, the mass fraction formula_1 is the ratio of one substance with mass formula_2 to the mass of the total mixture formula_3, defined as The symbol formula_5 is also used to denote mass fraction. The sum of all the mass fractions is equal to 1: Mass fraction can also be expressed, with a denominator of 100, as percentage by mass (in commercial contexts often called "percentage by weight", abbreviated