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# Why in the mountains it is hard to breathe?

With the removal from the earth's surface air density decreases. This is because the pressure in the upper layers of the atmosphere is lower than that of the earth.

What is the relationship between air pressure and its density?

It is clear and intuitive: the lower layers of air are under the most intense pressure than the top.

What does low blood pressure and reduced air density? This means that such thin air contains fewer molecules, including molecules of oxygen. That is why at high altitude hard to breathe.

### By the way...

At 0°C the mass of one cubic meter (1 m3) of air is:

• at the earth's surface - 1, 293 kilograms;
• at the altitude of 12 km - 319 grams;
• at a height of 40 km - 4 grams.

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#### Your comments:

 Dmitry2014-03-13 16:13:53 Why do you resent the fact that little is written? It is written primarily for children and for adults, who will then explain them clear and accessible language. If you don't know what the atmosphere and the air, something about this in detail can be read in the same Wikipedia. Answers to questions are brief, but very clear and correct. Thank you for the website) some2014-03-03 15:19:10 well!! Gleb2014-02-18 22:44:56 Little (( Marinka Marinka2014-02-16 16:12:19 I just didn't know Alinka2013-12-04 20:19:18 In space there is no air means the higher the harder and konchaetsa the air and on the ground plants which contain a special substance and it is easy to breathe Pavlovets Victoria2013-09-30 15:59:30 little Alina2013-05-24 16:28:20 I understood because in the mountains there are no plants will give the hard disazo and on earth well. Polina2013-03-22 13:49:41 I like the CLASS AAA2012-12-22 19:44:20 standards Student)2012-12-05 19:56:22 Yes a little door to a very

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