Question

At high altitude number of air molecules ______ and air pressure decreases.​

Answer 1

Answer:

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Answer 2

Answer:

At the higher altitude, air molecules will be decreases because most of the air molecules are present near the earth surface because of the gravity motion. So it is natural that at high altitude the air pressure will be decreased.

This brings down the average temperature of the system, i.e., the atmosphere at that altitude. In contrast, in low-altitude regions, air pressure is high, so air molecules don’t have as much freedom to move about. Carrying a lot of energy, they collide with each other more frequently, which causes the temperature of the system to increase.

This quantity may vary slightly depending on the molecular composition of air at a particular location. At IUPAC standard temperature and pressure (0 °C and 100 k Pa ), dry air has a density of 1.2754 kg /m³. At 20 °C and 101.325 kPa, dry air has a density of 1.2041 kg/m³.

Explanation: