Which of the following describes the best range of medium expansion foam?

Medium expansion foam typically has a range between 20 to 200 times its original volume. This classification is critical for understanding its application in firefighting, especially in scenarios involving flammable liquids or hazardous materials. The effectiveness of medium expansion foam lies in its ability to create a barrier between the fuel source and air, reducing the chances of reignition and suffocating the fire.

Using medium expansion foam in this range provides sufficient coverage and insulation over a surface, which is essential for controlling fires and preventing fire spread. It is instrumental in situations where larger volumes of foam are required to effectively manage larger fires or to protect the surrounding environment from fire hazards.

In contrast, other ranges either do not accurately reflect the properties of medium expansion foam or represent higher expansions that move into the categories of high expansion foam, which serves different purposes and has different characteristics. Understanding these distinctions helps firefighters and facility fire brigades determine the appropriate type of foam to use based on the specific firefighting conditions they encounter.