Medium-expansion foam creates a maximum expansion ratio of _____ to 1.

Medium-expansion foam is designed to provide effective firefighting solutions for certain types of fires, particularly those involving flammable liquids. The maximum expansion ratio refers to the amount of water that can be turned into foam through the use of air as an expansion agent. In the case of medium-expansion foam, it can achieve a maximum expansion ratio of 200 to 1. This means that for every part of the foam concentrate, 200 parts of foam can be produced through the introduction of air.

This high expansion ratio enables medium-expansion foam to blanket and smother fires while also providing insulation from heat and preventing reignition. The foam effectively coats the surface of burning materials, displacing oxygen and significantly interrupting the combustion process. Understanding this expansion property is essential for firefighters when choosing the appropriate type of foam for specific fire scenarios, particularly in environments where high expansion is needed to quickly cover and suppress widespread flammable liquid fires.