During the induction stroke, what happens to the temperature of the gases?

During the induction stroke of a reciprocating engine, the intake valve opens and the piston moves down, creating a vacuum that allows a mixture of air and fuel to be drawn into the combustion chamber. As this process occurs, the gas mixture expands into a larger volume. According to the gas laws, specifically the ideal gas law, when gases expand without any additional heat being added, the temperature of the gas decreases. This phenomenon is related to the fact that the gas molecules have more space to move around, leading to a drop in temperature as their kinetic energy decreases.

This is why the temperature of the gases reduces during the induction stroke, indicating that the answer is indeed correct. The other options relate to different aspects of gas behavior that do not accurately describe this phase of the engine cycle.