To qualify as an air mass, a large body of air must have the identically same temperature at the same altitude throughout the air mass, even if the body of air is 1,000 kilometers wide.

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Quizplus · Accepted Answer

To qualify as an air mass, a large body of air must have uniform temperature and humidity characteristics, but slight variations can occur within the air mass, especially over large distances like 1,000 kilometers. Uniformity is more about the general similarity rather than identical conditions at every point.

To Qualify as an Air Mass, a Large Body of Air