How does the presence of non-condensable gases affect the condensing pressure compared to the pressure required for condensation in their absence?

Refrigeration and Air Conditioning MCQs for PPSC, FPSC, NTS, and Pakistan government job tests. Select an option below, then read the explanation.

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Subject
Refrigeration and Air Conditioningmechanical-engineering-mcqs › refrigeration-and-air-conditioning
Published
25 Jan 2019
Last updated
28 May 2026

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Explanation

The presence of non-condensable gases raises the condensing pressure above the level needed when such gases are absent. This is because these gases reduce the partial pressure of the condensable vapor, requiring a higher total pressure to achieve condensation.

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