What two factors determine the flow from a solid stream nozzle?

The flow from a solid stream nozzle is primarily determined by two factors: the size of the discharge opening and the velocity of the stream. The size of the discharge opening directly influences the volume of water that can exit the nozzle. A larger opening allows more water to flow through, while a smaller opening restricts the flow. The velocity of the stream is equally crucial, as it determines how fast the water exits the nozzle. Higher pressure in the system usually increases the velocity, resulting in a more powerful stream.

The first factor, the discharge opening size, affects the cross-sectional area through which the water can flow. A larger cross-section permits a greater flow rate, enhancing the extinguishing effectiveness of the nozzle.

The second factor, velocity, affects how far and how forcefully the stream reaches its target. This combination of nozzle size and water velocity allows for effective control over the stream's characteristics, making it suitable for various firefighting scenarios.

The other options include factors such as water temperature, pipe length, and discharge angle, which do not have a direct role in determining the flow from a solid stream nozzle in terms of how much water is delivered or how effectively it can be used for firefighting. Thus, the correct focus is on the discharge opening size