The product of combustion that is measured in degrees of temperature to signify its intensity is:

The term that refers to the product of combustion measured in degrees of temperature to indicate its intensity is heat. Heat is the energy produced as a result of combustion, and it is a crucial factor in determining how intense a fire is. When evaluating the conditions and behavior of a fire, understanding heat is essential, as it directly influences fire spread, the potential for flashover, and the overall impact of the fire.

Flame, while associated with heat, refers specifically to the visible, luminous part of the fire where combustion is actively taking place, but it does not encompass heat as a measurable quantity. Smoke is the visible aerosol produced when materials burn incompletely; it contains a mixture of gases, particulates, and other combustion products, but it is not quantitatively measured in degrees of temperature. Fire gases are byproducts of combustion, including various chemical substances released during the burning process, and while they can contribute to the heat of a fire, they do not represent a singular measurement of intensity as heat does.