lasisiirtymä
Lasisiirtymä refers to a phenomenon observed in amorphous solids, particularly in glasses. It describes a reversible change in the physical properties of a glass when it is heated or cooled through a specific temperature range. This range is known as the glass transition temperature, often denoted as Tg. Below Tg, the material exists in a rigid, glassy state. Above Tg, the material becomes more viscous and exhibits properties more akin to a supercooled liquid.
During the glass transition, properties such as heat capacity, thermal expansion, and viscosity change abruptly. The
The glass transition temperature is a characteristic property of a given glass and depends on its chemical