What term describes the percentage of foam chemical contained in a foam solution?

The term that describes the percentage of foam chemical contained in a foam solution is concentration. Concentration refers to how much of a substance (in this case, the foam chemical) is present in a given volume of solution. It provides a clear measure of the strength or effectiveness of the foam solution when applied in firefighting operations.

Understanding concentration is crucial for firefighters as it directly influences the performance of foam when combating fires, particularly those involving flammable liquids. Higher concentrations may provide better coverage or suppression capabilities, while lower concentrations can be less effective. Knowing the correct concentration ensures that firefighters use the appropriate mix to achieve optimal results in various firefighting scenarios.

The other terms do not accurately reflect this concept. Density deals with mass per unit volume, which is not specific to the active ingredient in a solution. Composition refers to the makeup of a substance but does not express the percentage involved. Proportion indicates a relationship between quantities but lacks specificity in describing percentage concentration.