ASIS International (ASIS) Professional Certified Investigator Practice Exam

What is crazing in the context of a fire's effect on glass?

1. Glass completely shatters

2. Glass fractures but remains intact

3. Glass is melted completely

4. Glass absorbs heat without breaking

The correct answer is: Glass fractures but remains intact

Crazing in the context of a fire's effect on glass refers to a phenomenon where the glass develops a network of fine cracks while still remaining intact. This often occurs when glass is subjected to high temperatures, causing uneven expansion that leads to internal stresses. While the glass does not shatter completely, these superficial fractures can compromise its integrity and transparency, resulting in a cloudy or mottled appearance. This behavior contrasts with other options: if glass were to shatter completely, it would not be considered crazing. Likewise, complete melting of glass would indicate a different thermal response that does not align with the definition of crazing. Absorbing heat without breaking describes a potential response of materials that are designed to withstand heat, but this does not represent the typical behavior of glass when subjected to fire, as crazing signals the beginning of damage due to thermal stress. Therefore, the option regarding glass fracturing while remaining intact accurately reflects the concept of crazing.