Discussion
A glaze has a thermal expansion coefficient of 7.0 and a body 6.0, in units of a millionth per degree. Which fault is likely?
Answer: D
The glaze contracts more than the body on cooling and is therefore left in tension, which is the condition for crazing. Lowering the glaze expansion or raising the body's would bring the pair back into a safe relationship. A difference of one unit is more than enough to craze.
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