The air density is thin, and to what extent.

At sea level, at zero degrees Celsius, the air density is1292g per cubic meter, and the standard air pressure is10/3.2ml. The air density and air pressure in the plain area are almost the same as those at sea level. In Lhasa, Tibet at an altitude of 3,650 meters, the air density is 8 10g per cubic meter, and the annual average air pressure is 652ml, which is lower than that in the plain area 1/3. There is plenty of oxygen in the plains, with 250-260 grams per cubic meter of air, while the oxygen content in the air in the Qinghai-Tibet Plateau is only 150 ~ 170 grams, which is about 1/3 less than that in the plains. Due to the thin air, low dust and water vapor content, cleanliness and high transparency, the sky in Tibet is particularly blue and the scenery is particularly beautiful against the white clouds.

Due to the low oxygen content, when tourists first arrive in Tibet, they should walk slowly and rest more, walk more, climb more stairs and climb more temple steps, and don't rush. Prepare a bottle of wind-expelling oil or wind oil essence, and rub it on your temples and nose often to clear your head and relieve discomfort. Hotels, hotels and station wagons with good conditions in Tibet all have oxygen straws or oxygen bags. When tourists feel severe hypoxia, dyspnea and dizziness, they can immediately pull the oxygen bag to absorb oxygen, which can "get rid of the disease" and recover quickly.

Tourists will see Tibetan residents using pressure cookers at home. Because the air is thin and the air pressure is low, boiling water will only boil when it reaches 80℃. Without a pressure cooker, I don't even know the noodles. Tourists who smoke should pay attention to that kind of multi-time inflatable lighters or electronic lighters often do not burn in the Qinghai-Tibet Plateau, while disposable liquid pneumatic lighters are very convenient.

There is one characteristic of Tibetan dress. They usually wear only the left sleeve, and the right sleeve is pulled from the back to the chest and draped over the left shoulder, so that taking off one sleeve becomes a unique costume for Tibetans. This dressing habit is related to the unique climate in Tibet.

The temperature in Tibet is characterized by a small annual range and a large daily range. The daily average temperature in Lhasa, Shigatse and Qamdo ranges from 14- 16C. In Ali, which is more than 5000 meters above sea level, the daytime temperature can reach 10℃ in summer and August, and the temperature drops below zero at night, and streams and pools freeze. Every June, the highest temperature in Lhasa and Shigatse at noon can reach 27 ~ 29℃, giving people the feeling of midsummer. The temperature drops in the evening, and it makes people feel cool in autumn. At midnight, the temperature drops to 0 ~ 5℃, and the quilt should be covered all night, just like winter. After sunrise in Rosty Yi, the temperature rises again, just like in spring. In order to adapt to this special climate of "cold clothes are prepared all year round", Tibetans take off their sleeves to adjust their body temperature when the sun is shining during the day, and then wrap their robes tightly at sunset.

About 50kpa thin!