How much air is there at a height?

Air pressure, density, temperature and oxygen at any height from 500 m below sea level to 85 km up.

Air pressure

31.4 kPa

At 8,849 m above sea level the air pressure is 31.4 kPa, 31 % of the pressure at sea level, and the air temperature is −42.52 °C.

Air pressure in pascals: 31,400 Pa
Air density: 0.475 kg/m³
Temperature in kelvin: 230.6 K
Air temperature: −42.52 °C
Share of the pressure at sea level: 31 %
Pressure from oxygen alone: 6590 Pa

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How it is worked out

USSA76 layers: T = Tb + Lb*(h-hb)p = Pb*(T/Tb)^(-g0*M/(R*Lb)) (or Pb*exp(-g0*M*(h-hb)/(R*Tb)) if Lb=0)rho = p*M/(R*T)pO2 = xO2*p

Where the numbers come from

U.S. Standard Atmosphere 1976 (NASA TM-X-74335)

Keep in mind

The standard atmosphere is a global annual mean: real pressure swings ±2% with weather. Oxygen is always ~20.9% of the air, so thinner air means fewer O2 molecules per breath, not a smaller fraction.

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