Final answer:
Radial cracking of glass indicates remoteness from the point of origin and/or a relatively slow heat build-up. Pyrex®, with its small coefficient of linear expansion, is less susceptible to cracking from rapid temperature changes.
Step-by-step explanation:
When glass cracks in a pattern that indicates remoteness from the point of origin and/or a relatively slow heat build-up, it is known as radial cracking. Radial cracking occurs when the glass experiences a slow, even heating or cooling process. As a result, the glass expands or contracts uniformly, leading to cracks that radiate outwards from the center. For example, if a glass cooking pan is cooled rapidly or unevenly, it can experience differential contraction and create significant thermal stresses. However, Pyrex®, which has a small coefficient of linear expansion, is less susceptible to cracking. Its low coefficient of expansion helps it withstand rapid temperature changes without fracturing.