Certified Fire Investigator Practice Exam

At what temperature does wood begin to char?

1. Less than 392 F

2. 392 F to 536 F

3. 536 F to 932 F

4. Greater than 932 F

The correct answer is: 392 F to 536 F

Wood begins to char at temperatures between 392°F and 536°F. This process involves the thermal decomposition of wood, where it loses moisture and organic components, leading to the formation of char. Within this temperature range, volatile compounds are released as gases, and the wood starts to change structurally. At temperatures below 392°F, wood will not begin to char significantly; it may dry out or ignite, but charring is not the primary response. Conversely, temperatures above 536°F will lead to more extensive charring and ultimately carbonization, which is a further step beyond initial charring. Thus, the range specified provides a clear understanding of when wood transitions into a charred state, making this answer the most accurate for the question.