|
Tropospheric Elevation Dependence of Selected Atmospheric Variables |
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| Site | Sea Level** | C247 ESC | Timpanogos Summit | Mt. Everest Summit |
| Elevation [feet] | 0 | ~ 4670 | 11750 | 29002 |
| Fraction of Atmosphere Above [atm] | 1.00 | 0.84 | 0.64 | 0.33 |
| Air Density [kg/m3] | 1.29 | 1.08 | 0.83 | 0.43 |
| *Barometric Pressure [lbs/in2] | 14.7 | 12.3 | 9.4 | 4.9 |
| *Barometric Pressure [in of Hg] | 29.92 | 25.11 | 19.12 | 9.90 |
| H2O Boiling Point [°F] | 212 | 203 | 189 | 160 |
*Many different units are commonly used
in designating atmospheric pressure, for example, standard sea level
pressure may
be expressed as 1.00 atmospheres = 14.7 lbs/in2 = 29.92 in of Hg =
760 mm of Hg = 1013.25 millibar = 101325 Pascal.
**Mean sea level is not a constant level of reference. Because of global
warming and consequent glacial melting, the world's
seas have been rising by about one inch per decade.
Note that both the air
density and pressure scale proportionally to the percentage of the atmosphere
above a particular
elevation. Therefore the density and pressure in the ESC are
about 84% of their sea level values; on the Timpanogos
summit they are about 64% of their sea level values, etc.