<P> Note 1: The definition "crystal containing a second constituent which fits into and is distributed in the lattice of the host crystal" given in refs., is not general and, thus, is not recommended . </P> <P> Note 2: The expression is to be used to describe a solid phase containing more than one substance when, for convenience, one (or more) of the substances, called the solvent, is treated differently from the other substances, called solutes . </P> <P> Note 3: One or several of the components can be macromolecules . Some of the other components can then act as plasticizers, i.e., as molecularly dispersed substances that decrease the glass - transition temperature at which the amorphous phase of a polymer is converted between glassy and rubbery states . </P> <P> Note 4: In pharmaceutical preparations, the concept of solid solution is often applied to the case of mixtures of drug and polymer . </P>

Where does the solid material go when a solution is made