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On a light helicopter
It decreases. Air pressure is simply the pressure of all the other air on top of it. As you increase in elevation, there is less air on top of you. Therefore, the air pressure is less. As your altitude decreases, there is more air on top of you, therefore, the air pressure increases. Same with water. As you descend, water pressure increases. More on top of you.
Cold with very low pressure. The higher you go up it, the colder and less pressure there is.
It doesn't. Pressure is lower at the top of a mountain because there is less air weighing down on top of it.
The higher you are in the atmosphere, the lower the air pressure. Seeing that the top of a mountain is quite high, the air pressure is low; the air is thinner. This is why you need oxygen tanks to reach the top of Mount Everest
Hot air rises
There has to be lesser air pressure on the top of the wing to provide lift.
Air pressure decreases as height is gained. There is less air pressure at the top of a high mountain, than at sea level.
On top of a mountain
As you move from the bottom to the top of the mountain, the air pressure decreases.
Because air pressure (and water pressure) decrease the farther you get from the earth's center of gravity.
yes