what change sodo you notice in atmospheric pressure with increase in height?
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The atmospheric pressure decreases by about one millibar per 8 meters of altitude. Then it gets more and more and at 800 millibar altitude, you need to climb twice as much, about 16 meters to see a drop by one millibar.
That change of pressure is the base of the altimeter of an aircraft. You find your altitude by reading the pressure. But, to do that, it must be calibrated to the pressure reduced to sea level. We call that, the QNH. Before taking off and, when talking to different air traffic controller, the pilot gets the local QNH pressure. This is the only way to know if. e.g. we are high enough to pass over a mountain top.
But when high enough, and no obstacles can be found, all aircraft go to QNE, which is the standard pressure of 1013.25 millibar. When flying at cruise altitude, aircraft go up and down following high and low pressure regions. It doesn’t matter, the only thing that matters is the vertical separation between the aircraft, which is 1,000 feet of more.
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That change of pressure is the base of the altimeter of an aircraft. You find your altitude by reading the pressure. But, to do that, it must be calibrated to the pressure reduced to sea level. We call that, the QNH. Before taking off and, when talking to different air traffic controller, the pilot gets the local QNH pressure. This is the only way to know if. e.g. we are high enough to pass over a mountain top.
But when high enough, and no obstacles can be found, all aircraft go to QNE, which is the standard pressure of 1013.25 millibar. When flying at cruise altitude, aircraft go up and down following high and low pressure regions. It doesn’t matter, the only thing that matters is the vertical separation between the aircraft, which is 1,000 feet of more.
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