can have a much greater mobility than sucrose near the glass transition
point.) The diagram also gives the glass transition curveTgfor sucrose–
water mixtures. Below and to the right of the curve the system is in a glassy
state. When freeze concentration has proceeded to the point (Tg^0 ;c^0 s), a
glassy state is reached and no further freezing occurs.
FIGURE16.6 State diagram of the sucrose–water system.Tis temperature,cS
mass fraction of sucrose.Tfgives the freezing temperature of water andTSthe
solubility of sucrose. Tg is the glass transition temperature and Thom the
homogeneous nucleation temperature.