Input interpretation
hypsometric equation
Equation
P_2 = P_r exp(-(g (H_2 - H_r))/(287.003 T_r)) | P_2 | final pressure P_r | reference pressure T_r | reference temperature H_r | reference altitude H_2 | altitude g | standard acceleration due to gravity on the surface of the earth (≈ 9.807 m/s^2) (only valid if temperature constant between altitude levels)
Units
Input values
reference pressure | 0.5 atm (atmospheres) reference temperature | 220 K (kelvins) reference altitude | 5 km (kilometers) altitude | 20 km (kilometers)
Result
final pressure | 48.66 matm (milliatmospheres) = 4.931 kPa (kilopascals) = 4931 Pa (pascals) = 0.7151 psi (pounds-force per square inch) = 103 lbf/ft^2 (pounds-force per square foot) = 0.04866 atm (atmospheres) = 36.98 mmHg (millimeters of mercury) = 49.31 mbar (millibars)