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Substituting the reference altitude at sea level and takes on the local atmosphere for an average state, as described by the international standard atmosphere (temperature 15 ° C = 288.15 K, 1013.25 hPa air pressure, temperature gradient is 0.65 K per 100 m ), we get the international level formula for the troposphere (valid to 11 km altitude):
This formula allows the calculation of air pressure at a given height, without temperature and temperature gradient are known.The accuracy in the case of actual use is limited because the calculation is placed instead of the current atmospheric state based on an average atmosphere.
Daily fluctuations of temperature and pressure caused by the current weather conditions are not considered.