Air - Altitude, Density and Specific Volume

The density and the specific volume of air varies with the elevation above sea level

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The density of air will vary with the pressure (the Ideal Gas Law) and the altitude above sea level. Mean absolute pressure at sea level is approximately 760 mmHg (101.325 kPa, kN/m2) with a variation is about +/- 5%.

Altitude and Air Pressure

The air pressure varies with altitude as shown in the table below:

Altitude
(m)
Barometer
(mmHg)
0 749
75 743
150 735
250 726
300 723
450 709
600 695
750 681
900 668
1,000 658
1,200 643
1,350 632
1,500 620
1,800 598
2,100 577
2,400 555

Altitude and Air Density

Air density and specific volume as functions of altitude above sea level are indicated in the diagrams below:

air altitude meters density and specific volume diagram

air altitude feet density and specific volume diagram

 

STP - Standard Temperature and Pressure

NTP - Normal Temperature and Pressure

Altitude and Specific Volume Correction

The specific volume of standard air at a certain altitude can be calculated by multiplying with the volume correction factor below

Altitude Volume Correction Factor 
(m) (ft)
0 0 1.00
480 1600 1.05
990 3300 1.11
1500 5000 1.17
1980 6600 1.24
2460 8200 1.31
2970 9900 1.39

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Related Topics

  • Air Psychrometrics Air psychrometrics are the study of moist and humid air and the change of air condition - psychrometric charts, Mollier diagrams, air temperature and absolute and relative humidity, moisture content ..
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