True or false In the context of fluid mechanics the amount o

Solution

its true because the amount of mass enters into an system is the same mass which leaves the system like mass entering the nozzle and leaving. to explain more clearly

The conservation of mass is a fundamental concept of physics. the amount of mass remains constant mass is neither created nor destroyed. The mass of any object is simply the volume that the object occupies times the density of the object. For a fluid (a liquid or a gas) the density, volume, and shape of the object can all change within the domain with time. And mass can move through the domain.

Mass is the amount of matter contained in the body.
Wherever we go in the universe, the amount of matter in the body will remain same. Hence, the mass is constant everywhere.