What is the coefficient of expansion?

Unit 7 Topic 13
Using Unity Formula

This value expresses the degree of expansion and the contraction of a glaze or clay body resulting from the firing process.

As the glaze is heated to fusion range in the kiln, the volume of the glaze increases as a result of the physical and chemical changes taking place in the process.

As the glass cools the glaze, which expanded while being heated, contracts.

The same process of expansion and contraction occurs in the clay body to a different degree due to the different chemical makeup of the clay body.

The coefficient of expansion is a measure of how much the glaze has changed in volume as a result of firing.

Each glaze or clay body will have a different coefficient of expansion each reflecting the unique chemical composition of the glaze or clay.

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