What happens to pneumatic system efficiency if ambient temperature increases significantly?

In a pneumatic system, air acts as the working fluid. When the ambient temperature increases, the air density decreases because warm air expands and becomes lighter. This reduction in air density means that the system will require more air volume to perform the same work, which can lead to an increase in energy consumption. Consequently, the overall efficiency of the pneumatic system decreases.

Additionally, as the density of the air diminishes, the mass flow rate might also be affected, further reducing the effectiveness of the pneumatic system in transferring the necessary power to perform tasks. The decrease in efficiency due to lower air density is a fundamental characteristic of how gases behave under different temperature conditions. Thus, option C accurately describes the impact of significant increases in ambient temperature on a pneumatic system's efficiency.