formulas to check pressure at hight altitud

by Jaiem Mendoza
(New york USA.)

I need to set up an air compressor at ground level and run an air hose 200 feet height. What is the air pressure change at that height?

Barry's Response - How much less will the air pressure outside the hose at 200 feet than it be will be at the compressor level?

If that's the case, you can use a standard atmosphere calculator like the one at:

https://www.digitaldutch.com/atmoscalc/

It has the formulas to check pressure built right in.

From Sea level to 200 feet, the outside atmospheric pressure drops from 101325 Pa to 100595 Pa, a difference of 730 Pascals, a drop of about 0.7 %

The two hundred feet won't make much difference. One can expect a similar change to occur inside the hose from one end to the other as well.

Running through similar calculations to the one above gives changes of our 200 feet starting from various elevations from -2000 to 85000 metres. The result obtained using the numbers provided by the website referred to above ranged from approximately 0.3 % for very high elevations to 1 % for intermediate elevations (in the stratosphere).

The amount of percentage change depends on a number of things, the most obvious being atmospheric composition (changes in humidity, mostly) and the convective / stratification characteristics of the atmospheric layer in question.

Search this site for more information now.

The Sky-High Air Pump Adventure!

Imagine you have a cool air pump (that's our air compressor) on the ground and a long, twisty straw (that's your air hose) reaching 200 feet up. When you pump air into the straw, it has to travel all the way up. Guess what? The air faces a challenge as it climbs!

The higher you go, the less air there is pressing down on you. As you go higher up, our planet's atmosphere gets thinner. At 200 feet above ground, there's a bit less air pressure pushing down.

At ground level, the air pressure is about 100%. As you go up 200 feet, it drops a little bit - about 1%. At the top of your 200-foot straw, the air pressure is a little lower than at the bottom.

Don't worry! Your air compressor can still push air up the hose even if the air pressure changes. As the air gets higher, it's just a little harder.

Remember: the higher you go, the thinner the air gets, just like a long, thin straw with less and less air squeezing through it!
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