Since the air density decreases with height, that is, the higher the air pressure, the lower the air pressure. For ease of calculation, use the meteorologically derived conversion relationship between air pressure and altitude, and use the mean value of 760 mmHg to represent the sea level air pressure to calculate the percentage of air pressure at sea level for each altitude. This is the percentage of oxygen content in the plains to the oxygen content of the plain.
The altitude of Lhasa is 3,649 meters. Oxygen content accounts for 64% of the plains. Shiquanhe is 4,278 meters above sea level, with a percentage of 59%. Nagqu is 4,507 meters above sea level with a percentage of 56%.
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