Air pressure variation with height

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The pressure exerted by a column of air is significantly less than that of water due to the difference in density. While a 10-meter depth of water corresponds to approximately one atmosphere of pressure, the same height in air results in a much smaller pressure difference. Specifically, a 10-meter column of air would only create about 0.001 bar of pressure difference, not 1 bar. This is because the atmosphere extends roughly 10,000 meters high, making the pressure variation with height much less pronounced in air. Understanding these principles is crucial for accurately applying them in pneumatic systems.
jranjit
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Hi,

I understand the thumb rule that " the pressure exerted by ten metres depth of water is approximately equal to one atmosphere". Is it applicable for pneumatic systems too ?? that with 10 m head difference in air pressure lines there would be 1 bar difference in pressure between the ends

Please advise
 
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10m of water weighs the same as all the air above your head - so 10m of air is unlikely to weigh the same.
If the atmosphere is roughly 10,000m high then 10m head is about 10/10,000 of a bar different - otherwise you would need to decompress when standing up.
 

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