Most aeroplanes cabins are artificially pressurized. Why ?

1.	Most aeroplanes cabins are artificially pressurized. Why ?
Answer» Solution :The pressure decreases with the increases in altitude because there are fewer MOLECULES per unit volume of air. Above 9200m (30,000 FT. ) for example. where most aeroplanes fly, the pressure is so low that ONE could pass out for LACK of oxygen. For this REASON most aeroplanes cabin are artifically pressurized.

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