Dilatometers are measuring instruments. The thermal expansion coefficient α of the sample is defined as the rate of change of sample length with respect to the change in its temperature. Thermal expansion is a measurement of how entropy of a body reacts to changes of the volume. Dilatometers have a wide range of applications, such as in the fabrication of metallic alloys, compressed and sintered refractory compounds, glasses, ceramic products, composite materials, plastics, etc. Struc… (More on Dilatometer)