温度表征了从玻璃的弹脆（低温）状态到粘性（高温）状态的一定玻璃化转变范围。它用于指定冷却程序。通过测量由受试玻璃制成的杆的长度变化（与初始温度下的长度相关）来确定转变温度。根据温度绘制长度的相对变化（膨胀计曲线）。根据膨胀计曲线，通过图表所示的图形程序确定转变温度。

The temperature characterizes a certain glass transition range from the elastic brittle (low temperature) state to the viscous (high temperature) state of glass. It is used for specifying cooling programmes. The transformation temperature is determined by measuring the change in length, related to the length at intial temperature, of a rod made from the glass under test with temperature. The relative change in length is plotted against the temperature (dilatometer curve). From this dilatometer curve the transformation temperature is determined by a graphic procedure as shown in a diagramm.