What does a foam solution consist of?

A foam solution is created by mixing water and foam concentrate before introducing air. This process is essential because the foam concentrate provides the necessary properties for the foam to effectively suppress fires. When combined, the water and foam concentrate form a solution that is then aerated to produce the foam. This aeration introduces air into the solution, creating a stable foam that can blanket and smother a fire, reducing the availability of oxygen and cooling the fuel.

The other options do not correctly reflect the composition of a foam solution. Water and air alone lack the essential foam concentrate needed for fire suppression. Foam mixed only with additives does not account for the critical role of water in creating an effective foam solution. Therefore, understanding the right combination of water and foam concentrate before aerating with air is crucial for fire captains in making informed decisions about fire suppression methods.