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where:
- = reference pressure (Pa)
- = reference temperature (K)
- = temperature lapse rate (K/m) in ISA
- = height at which pressure is calculated (m)
- = height of reference level b (meters; e.g., hb = 11 000 m)
- = universal gas constant: 8.3144598 J/(mol·K)
- = gravitational acceleration: 9.80665 m/s2
- = molar mass of Earth's air: 0.0289644 kg/mol