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Question

What is air pressure and altitude? What is the relationship between them?

Answer 1

Air pressure is the weight of the air over any point in the atmosphere. The atmospheric air pressure at sea level is 1 atm or about 14.6959487755134 psi. The amount of air pressure is inversely proportional to your altitude. As your altitude increases the amount of air above you decreases and therefore has less weight which puts less pressure on you. As your altitude decreases the air pressure increases. So more altitude = less pressure and less altitude = more pressure. It's sort of like the deeper you dive in a pool the more pressure the water puts on you.

This is why a lot of altimeters (instruments used to measure altitude) use air pressure to measure the altitude.

Hope this helped

Answer 2

One way to conceptualize air pressure at different altitudes is using water...
If you jump in a pool the deeper you go the higher the pressure gets. if you throw a balloon in the water it will hold it's shape on the surface of the water. As you force it down deeper the balloon will shrink since the pressure gets higher the deeper you go. The reason why this pressure exists is because as you go deeper under water the amount of water 'above' you increases. the water near the bottom of the pool is actually being 'pushed' together by all the water above it. Air can be thought of in the same way. Being on the surface of the earth, we already start out at the bottom of the pool. As you go higher in altitude the lower the pressure gets. (sort of why your ears pop when you drive into the mountains)

Answer 3

Think of air,or the atmosphere as a blanket. Air does have mass. The thicker the blanket , the more it weighs, so the air pressure is more at sea level than it is on top of a mountain. So the higher you go the air pressure decreases and when you are in space, there is no air pressure , only a vacuum.

Answer 4

Air pressure is the force of the column of air over your head. As one goes higher in altitude, the less air there is so the less the air pressure.

Answer 5

air pressure is the pressure exerted by the atmosphere on an object. As you go up in altitude, pressure decreases because the air is less dense.

Answer 6

Air pressure is the pressure caused by collisions of air molecules.
Altitude is distance from the ground.
Because air molecules are attracted to the ground because of gravity, high altitude has less molecules, so there are less collinsions.
Higher you go up. less pressure there is.

Answer 7

Air pressure is the pressure of air pushing against things; even when there is no wind.

Altitude is how high up you are.

As you go up, air pressure gets less.

Answer 8

air pressure is the force bearing down on us from the atmosphere; it will vary from day to day depending on temperature, wind, location,etc.. altitude is an objects vertical distance from sea level. as the density of the atmoshere lessens as you gain altitude, so the air pressure will lessen.

Answer 9

Air pressure is about 30 inches of mercury, as measured with a mercury barometer, at sea level. It goes down at about 1 inch per thousand feet for the first few thousand feet above sea level, but the rate of decrease is not linear. I mean, it doesn't go to zero at 30,000 feet. Half the atmosphere is below you at 18,000 feet (or was it 16,000?), and 3/4 is below 36,000 (32,000?) feet and so on. Eventually, at hundreds of thousands of feet the pressure is almost zero and you are in space.