The air at an altitude of how many meters will be particularly fresh???

Experimental studies of human physiology and hygiene have found that the most suitable altitude for human survival is "500 2000" meters. 500 meters at low altitude, 2500 meters at medium altitude and 3500 meters at high altitude. 1500 meters is the low altitude.

After scientific research on physiological changes, starting at 1500 meters, for every 100 meters above sea level, the heartbeat increases by 15% 20%. Altitude has a great effect on the human body. In the past, my basic understanding was that the higher the altitude and the less dense the air, the more difficult it was for humans to breathe.

And, because I'm used to normal air pressure, when I go to a place at a higher altitude, the blood flow slows down and I feel suffocated. And, the higher the altitude, the more difficult it is to cook. Some**nosebleeds.

Geographical experts at home and abroad have found that the most suitable altitude for human survival is about 500 meters to 2000 meters, while the Xichang urban area is about 1500 meters, and the Qionghai Lushan Scenic Area is 2044 meters, which is the most suitable for human habitation.

The mountain climate above 1500 meters above sea level has low oxygen partial pressure, strong solar radiation, so the ultraviolet rays are sufficient, which greatly reduces the probability of human respiratory diseases, although the average daily temperature at this height is lower than the plain, but the airflow activity is less, although there is fog on the mountain, but the actual water vapor content is less, therefore, the winter is warm and the summer is cool, less dust and less bacteria, the air is fresh, and the infection and occurrence of respiratory diseases can be reduced.

The most suitable altitude for human survival is 500 meters to 2000 meters, about 1500 meters in Zuocheng District, and 2044 meters in Qionghai Lushan Scenic Area, which is the most suitable for human habitation.

The air quality at high altitudes is good but the oxygen content is low, and altitude sickness can occur without an adaptation process.

Kunming is higher than the coastal area, about 2000 meters, the oxygen content is to be low, but it is not a big problem for the human body, Kunming is a tourist city, the four seasons are like spring, the greening is very good, even if it is a long-term life by the sea, people come to Kunming to live will not produce altitude sickness, as for the health preservation, I think there is no impact on it, people living on the Qinghai-Tibet Plateau also have to maintain health!

The air at an altitude of 200 meters must be thinner than the air on the ground (the air density becomes smaller), and it can be seen from the gravitational force formula that the gravitational force is inversely proportional to the square of the distance, and then consider the centrifugal force generated by the rotation of the earth (the angular velocity is the same, it is a revolution in 24 hours, the higher the altitude, the greater the linear velocity, the greater the centrifugal force), it can be seen that the higher the height from the ground, the thinner the air (the lower the air pressure). However, since 200 meters is too close to the ground, the density difference between the two is not much.

A: There is no significant difference between the air at a height of 200 meters and the air on the ground.

The first thing to say is that a height of 200 meters is really not a high altitude, you climb it.

The 200-metre-high hill can be a bit tiring, but staying at the top for a while may feel thinner than the air below, but probably fresher. There are also buildings above 200 meters, and if the air is thin, no one will build such a tall building.

At least 4 kilometers above sea level, we can feel the difference in air pressure when exercising, and then the air gradually becomes thinner.

200 meters is not considered high, it is 6070-storey building. The air is not much different from the ground.

The world's tallest building is more than 400 meters, and I have never heard of people not being able to live there.

It should be related to your physique, the humidity in the area you are in is heavier, maybe your body is more damp, so there will be chest tightness and poor breathing, etc., to those high-altitude places, because the air is relatively dry and cool, so the excess moisture in your lungs is reduced, and you will have the feeling of breathing smoothly.

It's not surprising that these places you go to are not really plateaus, just within more than two thousand, at this height in these places, the air quality is quite good, the oxygen content can fully meet the needs of the body, there will be no obvious lack of oxygen, due to the fresh air, there is no discomfort caused by the lung filtration effect brought by urban haze, there are often people who feel very comfortable in the chest, and the sense of relaxation is obvious, as for wanting to smoke, you may have a certain potential influence of surrounding factors.

The Qinghai-Tibet Plateau has a high altitude and thin air, but the air is very fresh, because it is sparsely populated, and there are no heavy industrial enterprises that pollute the environment, and there are more grasslands.

Because the air on the Qinghai-Tibet Plateau is thin because of high pressure, but the Qinghai-Tibet Plateau has a good environment, so the air is fresh.

Because there is a lot of green vegetation on the Qinghai-Tibet Plateau, the air purification ability is very strong, so the air will be very fresh.

Relatively speaking, there are relatively few people in high-altitude areas, and the air is not polluted, so it will definitely feel very fresh.

Mainly environmental factors, the population density is relatively small. The human factor has a weak impact on the natural environment.

Because the terrain of the Qinghai-Tibet Plateau is particularly high, generally dirty things will sink, and the above ones will be very fresh.

More than 4000 meters. Very good, compared to the mainland, it is holy that is less oxygen, 78910 autumn is the best time to travel.

There is no oxygen above 1000 km. Because the thickness of the atmosphere is about 1000 kilometers.

Atmospheric composition.

The atmosphere, also known as the atmosphere, is a layer of mixed gas that surrounds the earth due to gravity, and is the outermost gasosphere of the earth, surrounding the ocean and land, and the atmosphere has no exact upper bound;

There are still thin gases and elementary particles at altitudes of 2,000 to 16,000 kilometres above the surface, and small amounts of gases in the ground, in the soil and in some rocks, which can also be considered as an integral part of the atmosphere, and the main components of the Earth's atmosphere are nitrogen, oxygen, argon, carbon dioxide and less than a proportion of trace gases, which are called mixtures of gases.

Layered features. The entire atmosphere exhibits different characteristics with different altitudes, and is divided into troposphere, stratosphere, ozone layer, mesosphere, thermosphere and fugitive layer, and above it is interstellar space.

Outer layer 1, defines the outer sphere (exosphere), also known as the exosphere, above the thermosphere is the outer atmosphere, extending to 1000 kilometers above the earth's surface. The temperature here is high, up to thousands of degrees; The atmosphere is extremely thin, with a density of 1 billionth at sea level.

2. Features. The outer atmosphere, also called the magnetosphere, is the outermost layer of the atmosphere, the area where the atmosphere transitions to interstellar space, and there is no obvious boundary outside. In general, the upper limit is lower near the geomagnetic pole, and the near-magnetic equator is on the sun-facing side, about 9 10 Earth radii high.

The closer the mass of the atmosphere is to the sea level, the denser the atmospheric pressure, including the partial pressure of oxygen, becomes. The higher the altitude, the atmospheric pressure and the partial pressure of oxygen decrease correspondingly, that is, for every 100 meters of altitude, the atmospheric pressure decreases by millimeters of mercury, and the partial pressure of oxygen decreases by about millimeters of mercury.

According to the above principle, the partial pressure of oxygen is millimeters of mercury at an altitude of 0, the partial pressure of oxygen in one millimeter of mercury is equivalent to the oxygen content, the altitude increases by 100 meters, the atmospheric pressure decreases by millimeters of mercury, the partial pressure of oxygen decreases by about millimeters of mercury, and the oxygen content decreases, compared with the oxygen content at an altitude of 0 meters, it decreases.

For example, if the altitude is 0 meters, the oxygen content of the air decreases by 0%, and the oxygen content of the air is 100% of the oxygen content of 0 altitude;

At an altitude of 100 meters, the oxygen content of the air decreases, and the oxygen content of the air is 0 oxygen content at the altitude;

At an altitude of 1000 meters, the oxygen content of the air decreases, and the oxygen content of the air is 0 oxygen content at the altitude;

At an altitude of 5000 meters, the oxygen content of the air decreases by 8%, and the oxygen content of the air is 0 at the altitude of 0 altitude oxygen content.

At an altitude of 10,000 meters, the oxygen content of the air decreases by 16% The oxygen content of the air is 0 at the altitude of 0;

At an altitude of 130,930 meters, the oxygen content of the air decreases, and the oxygen content of the air is 0%, which is 0% of the oxygen content at 0 altitude