This occurs when intense radiated heat or direct flame contacts a surface during the fire, burning away deposits.

This occurs when intense radiated heat or direct flame contacts a surface during the fire, burning away deposits.

• A. Char
• B. Sooting
• C. Clean Burn
• D. Burn-through

Answer: (C)

The situation describes a clean burn. When intense radiated heat or direct flame contacts a surface, it can raise the surface temperature enough to burn away the deposits on it, leaving a relatively clean area rather than a char or a soot layer. This is different from charring, which shows a blackened carbonized layer from pyrolysis; from sooting, which leaves soot deposits on the surface; or from burn-through, which involves the flame actually burning through the material. So burning off the deposits to leave a clean surface is the hallmark of a clean burn.

The situation describes a clean burn. When intense radiated heat or direct flame contacts a surface, it can raise the surface temperature enough to burn away the deposits on it, leaving a relatively clean area rather than a char or a soot layer. This is different from charring, which shows a blackened carbonized layer from pyrolysis; from sooting, which leaves soot deposits on the surface; or from burn-through, which involves the flame actually burning through the material. So burning off the deposits to leave a clean surface is the hallmark of a clean burn.