How can passengers affect the CACS's performance during flight?

Passengers can significantly influence the performance of the Cabin Atmosphere Control System (CACS) by increasing humidity levels due to their breathing and activities. When passengers breathe, they expel moisture in the form of water vapor, which raises the humidity within the cabin. This added moisture can affect the CACS as it is designed to manage and maintain specific levels of humidity for optimal comfort and health.

An increased humidity level may require the CACS to work harder to maintain the desired atmosphere inside the aircraft, possibly leading to adjustments in temperature or air circulation. This is particularly relevant in the enclosed environment of an aircraft, where every passenger contributes to the overall cabin atmosphere. Such factors underscore the importance of understanding how human activities can impact systems designed to ensure passenger comfort and safety during flight.