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Friction loss in hoses refers to the pressure loss that occurs as water flows through the hose due to the internal friction of the water against the hose material. In the case of 3 1/2 inch hose, the friction loss is considered negligible because this size is intended for high-volume flow. It provides a larger diameter for water to travel through, leading to less resistance compared to smaller hoses.

When determining the friction loss for various hose sizes, it is essential to consider the flow rates and the hose material. Since the 3 1/2 inch hose can manage high volumes with minimal resistance, the friction loss does not significantly impede the flow. This characteristic makes it ideal for situations where a large amount of water is needed, such as in firefighting applications.

Understanding friction loss is critical for firefighters as it impacts the pressure settings needed at the pump to ensure adequate water supply at the nozzle. In contrast to larger friction losses associated with smaller diameter hoses, 3 1/2 inch hoses exhibit a much lower rate, affirming the selection of negligible as the most appropriate descriptor for their friction loss.