What is defined as the propagation of flame over a surface?

The term that refers to the propagation of flame over a surface is flame spread. This concept is crucial in fire safety and building inspections, as it describes how quickly and extensively flames can move across materials. Understanding flame spread helps inspectors assess fire hazards within buildings, particularly concerning the materials used in construction and their susceptibility to catching fire and contributing to the spread of flames.

In a practical context, flame spread ratings are often used to evaluate materials for their fire resistance; lower flame spread ratings indicate materials that will slow down the movement of flames and can enhance overall safety in building design. Knowledge of flame spread is essential for preventing fires from rapidly expanding in commercial properties, ultimately protecting lives and property.