What is the nozzle pressure for a standard master stream with a fog nozzle?

The nozzle pressure for a standard master stream equipped with a fog nozzle is typically set at 100 psi. This pressure provides an effective balance between reach and spray pattern, allowing for adequate water distribution over a wide area, which is crucial in firefighting situations.

The 100 psi setting is aligned with industry practices, ensuring that the water stream is powerful enough to penetrate fire and cool the surrounding areas without becoming excessively forceful or difficult to control. Master streams are designed for large-scale firefighting operations, where creating an effective water curtain or creating a fine mist can enhance cooling and penetration into the fire, making this pressure optimal for the performance of fog nozzles specifically.

The other choices do not align with the standard operational practices for fog nozzles in master stream applications, which is why 100 psi stands out as the correct answer.