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

Heat is the correct answer because it refers to the energy that is produced during the combustion process, which is typically measured in degrees, such as Celsius or Fahrenheit. This measurement signifies the intensity of the combustion and indicates how much thermal energy is being generated. An increase in temperature indicates a higher intensity of heat being produced as a result of the combustion reactions taking place.

Heat plays a critical role in fire dynamics, influencing how materials ignite and how a fire spreads. Understanding heat is essential for fire safety educators as it pertains to teaching about fire behavior, prevention strategies, and safety measures.

In contrast, flame refers to the visible, gaseous process of combustion that emits light and heat but is not a direct measurement of temperature. Smoke is a product of incomplete combustion and consists of tiny solid, liquid, and gas particles, making it important for understanding fire effects, but it doesn't indicate temperature. Fire gases are also byproducts of combustion but typically concern the harmful chemicals released rather than temperature measurements, making them less relevant for this specific query about intensity measured in degrees.