During the isobaric range, which quantity remains constant?

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Multiple Choice

During the isobaric range, which quantity remains constant?

Explanation:
Isobaric range means keeping the same pressure inside the cabin while the airplane changes altitude. The cabin pressurization system actively regulates and maintains a fixed cabin pressure (and a corresponding cabin altitude) as outside air pressure drops with altitude. So, even though you’re climbing or descending, the pressure inside stays essentially constant. Outside temperature changes with altitude, and the aircraft’s altitude can change as you fly, so those aren’t held constant. Ventilation rate is managed for air quality and comfort and isn’t the parameter defined by isobaric conditions.

Isobaric range means keeping the same pressure inside the cabin while the airplane changes altitude. The cabin pressurization system actively regulates and maintains a fixed cabin pressure (and a corresponding cabin altitude) as outside air pressure drops with altitude. So, even though you’re climbing or descending, the pressure inside stays essentially constant. Outside temperature changes with altitude, and the aircraft’s altitude can change as you fly, so those aren’t held constant. Ventilation rate is managed for air quality and comfort and isn’t the parameter defined by isobaric conditions.

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