Final answer:
Fire flow from hydrants is the amount of water available at a residual pressure for firefighting, and it can be calculated using principles of fluid dynamics.
Step-by-step explanation:
In the context of firefighting, fire flow from hydrants refers to the amount of water that is available at a residual pressure for firefighting.
For example, a fire hose with an inside diameter of 6.40 cm carries a flow of 40.0 L/s, starting at a gauge pressure of 1.62 × 106 N/m². The hose then rises up 10.0 m along a ladder to a nozzle with an inside diameter of 3.00 cm.
In this scenario, the pressure in the nozzle can be calculated using principles of fluid dynamics.