Heat naturally moves from areas of:

Heat naturally moves from areas of higher temperatures to lower temperatures due to the second law of thermodynamics, which states that energy spontaneously tends to flow from regions of higher energy (or temperature) to regions of lower energy (or temperature) until thermal equilibrium is reached. This principle is foundational in understanding heat transfer processes, whether through conduction, convection, or radiation.

For instance, if you place a hot object next to a cooler one, the heat will flow from the hot object to the cooler one until both objects reach the same temperature. This process occurs in various fire-related scenarios, such as the spread of heat in a building during a fire or the way heat radiates from flames. Recognizing this principle is crucial for fire investigators, as it helps them assess fire behavior, potential fire spread, and the conditions of materials involved in a fire incident.