Question

Your company returns to the scene of a fire from the previous night tour and the fire marshal is on scene. While looking through the fire area you notice an area with heavy smoke stains and on the intact glass you see large crazing. You would be most correct if you were to think?

A: This fire had a rapid and intense heat build up.
B: This fire had a slow heat build up and this area was remote from the point of origin.
C: This area was close to the fire's point of origin.
D: Water was applied to heated glass causing the crazing.

Answer 1

Large crazing on glass after a fire usually indicates a rapid and intense heat build-up rather than a slow heat build-up or water causing the crazing.

Step-by-step explanation:

When observing an area with heavy smoke stains and intact glass showing large crazing after a fire, it would be most correct to think that This fire had a rapid and intense heat build-up. The rapid expansion of the glass from intense, rapid heating, followed by sudden cooling, can cause crazing - a network of fine cracks. Since glass is a poor conductor of heat, the presence of crazing patterns generally suggests rapid temperature changes rather than a slow heat build-up or exposure to water from firefighting efforts.