What Is the Density of Compressed Air?

AI Thread Summary
The density of compressed air can be calculated by starting with the density of normal air and adjusting it based on the pressure it is under. The formula pV = mRT can be rearranged to find density, where density (m/V) equals pressure (p) divided by the product of the gas constant (R) and temperature (T). For ideal gas conditions, this method is accurate at high temperatures and low pressures, typically up to 40-50 bar. At 1 atm and 20 degrees Celsius, the density of dry air is approximately 1.20 kg/m³. Understanding these principles is essential for accurate calculations in applications involving compressed air.
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does anyone happen to know the density of compressed air?
 
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It's whatever I want it to be.
 
minger said:
It's whatever I want it to be.
:smile:

Start with the density of normal air then multiply by however many atmospheres of pressure it's under.
 
you should start with

pV = mRT, divide by (V R T), and you get

m/V = p/RT.

p - pressure [Pa], V - volume [m3], m - mass [kg], R - gas constant (287 kJ/kg), T - temperature [K]

note that this is for ideal gas and so only accurate for high temperatures (room) and low pressures (up to 40, 50 bar).

check out this page: http://en.wikipedia.org/wiki/Compressibility_chart
 
For 1 atm (760 mm Hg, or ~100,000 Pa) dry air at 20 deg C, the density is about 1.20 kilograms per cubic meter.
 
>0.0 kg/m3
 

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