Final answer:
In an internal combustion engine, the inlet and outlet mass should remain constant according to the law of conservation of mass, as no mass is created or destroyed during the combustion process.
Step-by-step explanation:
The question pertains to the conservation of mass in internal combustion engines. According to the law of conservation of mass, the mass of substances within a closed system must remain constant over time.
In the context of an internal combustion engine, the inlet mass refers to the mass of fuel and air entered into the combustion chamber, while the outlet mass refers to the mass of exhaust gases expelled.
During this process, no mass is created or destroyed; it is simply converted from one form to another (fuel and air transformed into exhaust gases and energy).
Therefore, the correct answer to the question is: Inlet mass vs outlet mass in internal combustion remains constant (Option A). Any slight differences in measured inlet and outlet masses could be due to measurement errors or minor leaks, but ideally, these masses should be equal, adhering to the conservation of mass principle.