The lowest air pressure can be witnessed at point 1.
Air pressure
The pressure caused due to the weight of the molecules of the air above is known as air pressure.
There is a relationship between the altitude and the air pressure.
The mountaineers and aviators can determine their altitude by measuring the air pressure surrounding them.
With the rise in altitude, the air pressure declines, that is, when altitude is high, the air pressure will be less.
The two reasons of reduction in air pressure is gravity and density.
With increase in altitude, the concentration of the molecules of gas in the air reduces, the air turns less dense in comparison to the air closer to the level of the sea. The thin air exhibits less pressure in comparison to air at a lower altitude.
Due to this, pressure of air at point 1 will be the least, and the air pressure at point 4 will be the most.
Thus, at point 1, air pressure will be the lowest.
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