During a flight over the sea at FL 100 from Marseille (QNH 1016 hPa) to Palma de Mallorca (QNH 1016 hPa), the true altitude is constantly decreasing. What is the probable reason for this?

Question

Answer

The altimeter is faulty

Answer

One of the QNH values must be wrong

Answer

The air over Marseille is warmer than that over Palma de Mallorca

Answer

The air over Palma de Mallorca is warmer than that over Marseille

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During a flight over the sea at FL 100 from Marseille (QNH 1016 hPa) to Palma de...

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