Which of the following materials is known for producing high heat during combustion?

Plastic is known for producing high heat during combustion due to its chemical composition and the energy content it holds. When plastics burn, they can release a large amount of energy in the form of heat, leading to higher temperatures than many other materials. This is attributed to the fact that many plastics are derived from petroleum and contain hydrocarbons, which have high-energy potential when they undergo combustion.

Additionally, the combustion of plastics can result in the production of toxic smoke and gases, contributing to hazardous conditions in a fire situation. This property makes plastics a significant consideration in fire safety protocols and regulations, especially in environments where large amounts of plastic are present.

In contrast, cardboard, glass, and metal do not have the same high heat output during combustion processes. Cardboard burns but generally at a lower temperature and energy release compared to plastics. Glass, being inorganic, does not combust; instead, it may soften and melt under extreme heat without contributing to a fire. Metals, depending on type and condition, may burn but usually require a significant amount of heat to initiate combustion and are not classified as materials that produce high heat quickly when exposed to flames.