Discussion
Assertion (A): A glaze and a body are both measured on a dilatometer before a glaze is put into production.
Reason (R): Crazing and shivering both arise from a mismatch in thermal expansion between the two.
Answer: D
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the purpose. Crazing occurs when the glaze contracts more than the body and ends in tension; shivering when it contracts less and ends in excessive compression. Both are expansion mismatches, so both are predicted by measuring the two expansion curves on a dilatometer before committing the glaze to production - the glaze being aimed at a slightly *lower* expansion than the body so that it finishes in mild compression.
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