At what temperature range is a combustible material likely to ignite?

The correct answer highlights that a combustible material is likely to ignite at a temperature range between 100-200 degrees Fahrenheit. This range is significant because many common materials, such as certain chemicals, paper, or fabrics, have their flash points— the minimum temperature at which they can vaporize to form an ignitable mixture in air—falling within this range.

Ignition occurs when material reaches its flash point, and at temperatures below 100 degrees Fahrenheit, most combustible materials are typically too cool to ignite without an external ignition source. On the other end, while it's true that materials can potentially ignite at temperatures over 200 degrees Fahrenheit, this is typically considered a higher threshold not reflective of the typical combustibility, which is more commonly associated with the specified range. Hence, the range of 100-200 degrees Fahrenheit represents a more practical scenario for potential ignition of combustible materials.