If a pressurized aircraft flying at high altitude suffers ra

If a pressurized aircraft flying at high altitude suffers rapid decompression, a cloud can form in the cabin. Explain. Consider an aircraft with cabin pressure equal to atmosphere pressure at 5000 ft and flying at 30000 ft. If the temperature of the cabin air is 20C and its relative humidity 20%, can a cloud form if there is rapid decompression? Below approximately what would the aircraft have to be flying such that a cloud could not form upon cabin decomposition ?

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