This is the initial altitude used in calculating the atmospheric pressure difference between two altitudes. This is the absolute pressure of air at a particular level in the atmosphere. This is the geopotential height above or below mean sea level. K (* Defined by US Standard Atmosphere 1976 which differs from the current SI defined value of 8.31446261815324).R* = Universal gas constant = 8.31432 J/mol.M = Molar mass of Earth’s atmosphere = 0.0289644 kg/mol.g = Standard acceleration due to gravity = 9.90665 m/s 2.L b = Standard temperature lapse rate to change reference temperature (T b) between atmosphere transitional layers from b = 0 to 6.T b = Reference temperature at interface between atmosphere transitional layers from b = 0 to 6.H b = Geopotential altitude from mean sea level of interfaces between atmosphere transitional layers from b = 0 to 6.ΔH = Geopotential altitude difference from P 1 to P 2 atmospheric pressure.H = Geopotential altitude relative to mean sea level. P b = Atmospheric pressure at interfaces between atmosphere transitional layers from b = 0 to 6.ΔP = Atmospheric pressure difference from H 1 to H 2 altitude.The formulas used by this us standard atmosphere altitude and air pressure calculator to determine each individual parameter are: If every measurement instrument is calibrated with the same atmospheric model the readings can be directly compared. However despite the dynamic nature of the atmosphere, standard atmosphere models serve as a way of standardising measuring instruments. In reality the atmospheric pressure, temperature & humidity level in the air are constantly changing, therefore the accuracy in determining the true altitude is limited by this. The atmospheric model assumes the air is a dry ideal gas, with an atmospheric pressure of 101325 Pa and a temperature of 288.15 K at mean sea level. The method and formulas used are based on the US Standard Atmosphere 1976 model for use from a height of 5000 metres below mean sea level up to a height of 84,852 metres above mean sea level. This tool which is based on the us standard atmosphere model will calculate the air pressure at a height above or below sea level, the altitude from the atmospheric air pressure at the same level, the pressure difference between two altitudes, and the altitude difference between two atmospheric pressures.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |