Nozzle reaction is explained by which law of physics?

The concept of nozzle reaction is best described by the principle that for every action, there is an equal and opposite reaction. This principle, articulated by Newton's third law of motion, explains how the force of water exiting the nozzle creates a reactive force that pushes back against the operator of the nozzle. When water is ejected at high velocity from the nozzle, it generates a corresponding force in the opposite direction, which affects the handling and control of the hose by the operator. This understanding is crucial for effective firefighting, as it allows operators to anticipate and manage the recoil generated by the nozzle, ensuring they maintain control while suppressing fires.

The other options, while important in their respective contexts, do not specifically address the mechanics of nozzle reaction. The Law of Conservation of Energy relates to the transformation of energy rather than the forces involved in the nozzle's operation. Newton's 1st Law deals with inertia and does not specifically explain the interaction of forces in this scenario. Lastly, the Law of Gravity pertains to the attraction between masses and does not directly influence the behavior of water flow and nozzle operation.