Final answer:
The statement that vacuum pump exhaust should be piped outside is true. It is a standard safety practice to ensure harmful vapors are not released indoors. This aligns with the principles of fluid dynamics and engineering safety standards.
Step-by-step explanation:
The statement provided can be considered true in the context of general safety and operational standards for vacuum pumps. The exhaust from vacuum pumps typically contains vapors or particles that may be harmful if inhaled or may contribute to a hazardous environment if released indoors. Therefore, it is a common and often necessary practice to have the exhaust from the vacuum pumps piped to the outside to ensure those vapors or particles are safely ventilated away from workspaces and not posing a risk to people or the environment. When dealing with the dynamics of fluids, as in the provided reference information, the absolute pressure in the hose is indeed greater than in the nozzle, which aligns with principles from fluid dynamics that when the velocity of a fluid (v) increases, such as in a constriction like a nozzle, the pressure decreases according to the Bernoulli's equation.
For the case at hand, assuming no other changes occur, the pressure at the nozzle P₂ must be atmospheric because the fluid exits into atmospheric conditions. Engineering practices would dictate that the design of such systems ensures safety and functionality which includes addressing the exhaust and pressure conditions accordingly.