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On top of a mountain
Because air pressure (and water pressure) decrease the farther you get from the earth's center of gravity.
The top.
Scroll down to related links and look at "Density of air - Wikipedia" and "Atmospheric pressure - Wikipedia". The density of air is the mass per unit volume of Earth's atmosphere. Air density decreases with increasing altitude, as does air pressure. Air pressure (N/m² = Pa) is a column of air pushing on top of you. If you think of a stack of books, then the bottom has the greatest pressure and the top has the least.
beach
uh it's 10.3828482. but that's just off the top of my head
uh it's 10.3828482. but that's just off the top of my head
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.
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.
The pressure of the air on one square-inch of your head is the weight of air from that square-inch all the way up to the top of the atmosphere. As you go up in elevation, some of the atmosphere is below you, and there is less of it above you. So the weight on each square inch, and thus the air pressure, becomes less.
Air pressure decreases as height is gained. There is less air pressure at the top of a high mountain, than at sea level.
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On top of a mountain
Because air pressure (and water pressure) decrease the farther you get from the earth's center of gravity.